diff --git a/lib/src/rules/use_colored_box.dart b/lib/src/rules/use_colored_box.dart
index aa0b460e4..fca61485b 100644
--- a/lib/src/rules/use_colored_box.dart
+++ b/lib/src/rules/use_colored_box.dart
@@ -6,6 +6,7 @@ import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 
 import '../analyzer.dart';
+import '../util/dart_type_utilities.dart';
 import '../util/flutter_utils.dart';
 
 const _desc = r'Use `ColoredBox`.';
@@ -49,16 +50,17 @@ class UseColoredBox extends LintRule {
   @override
   void registerNodeProcessors(
       NodeLintRegistry registry, LinterContext context) {
-    var visitor = _Visitor(this);
+    var visitor = _Visitor(this, context);
 
     registry.addInstanceCreationExpression(this, visitor);
   }
 }
 
 class _Visitor extends SimpleAstVisitor {
-  final LintRule rule;
+  _Visitor(this.rule, this.context);
 
-  _Visitor(this.rule);
+  final LintRule rule;
+  final LinterContext context;
 
   @override
   void visitInstanceCreationExpression(InstanceCreationExpression node) {
@@ -66,13 +68,13 @@ class _Visitor extends SimpleAstVisitor {
       return;
     }
 
-    var data = _ArgumentData(node.argumentList);
+    var data = _ArgumentData(node.argumentList, context);
 
     if (data.additionalArgumentsFound || data.positionalArgumentsFound) {
       return;
     }
 
-    if (data.hasColor) {
+    if (data.hasNonNullColor) {
       rule.reportLint(node.constructorName);
     }
   }
@@ -81,20 +83,25 @@ class _Visitor extends SimpleAstVisitor {
 class _ArgumentData {
   var positionalArgumentsFound = false;
   var additionalArgumentsFound = false;
-  var hasColor = false;
+  var hasNonNullColor = false;
 
-  _ArgumentData(ArgumentList node) {
+  _ArgumentData(ArgumentList node, LinterContext context) {
     for (var argument in node.arguments) {
       if (argument is! NamedExpression) {
         positionalArgumentsFound = true;
         return;
       }
-      var label = argument.name.label;
-      if (label.name == 'color') {
-        hasColor = true;
-      } else if (label.name == 'child') {
+      var name = argument.name.label.name;
+      if (name == 'color') {
+        // Not lint if color is null or nullable because a ColoredBox only
+        // accepts a non-null Color
+        if (DartTypeUtilities.isNonNullable(
+            context, argument.expression.staticType)) {
+          hasNonNullColor = true;
+        }
+      } else if (name == 'child') {
         // Ignore child
-      } else if (label.name == 'key') {
+      } else if (name == 'key') {
         // Ignore key
       } else {
         additionalArgumentsFound = true;
diff --git a/lib/src/rules/use_decorated_box.dart b/lib/src/rules/use_decorated_box.dart
index f4c12914b..2ff3924bb 100644
--- a/lib/src/rules/use_decorated_box.dart
+++ b/lib/src/rules/use_decorated_box.dart
@@ -6,6 +6,7 @@ import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 
 import '../analyzer.dart';
+import '../util/dart_type_utilities.dart';
 import '../util/flutter_utils.dart';
 
 const _desc = r'Use `DecoratedBox`.';
@@ -59,16 +60,17 @@ class UseDecoratedBox extends LintRule {
   @override
   void registerNodeProcessors(
       NodeLintRegistry registry, LinterContext context) {
-    var visitor = _Visitor(this);
+    var visitor = _Visitor(this, context);
 
     registry.addInstanceCreationExpression(this, visitor);
   }
 }
 
 class _Visitor extends SimpleAstVisitor {
-  final LintRule rule;
+  _Visitor(this.rule, this.context);
 
-  _Visitor(this.rule);
+  final LintRule rule;
+  final LinterContext context;
 
   @override
   void visitInstanceCreationExpression(InstanceCreationExpression node) {
@@ -76,13 +78,13 @@ class _Visitor extends SimpleAstVisitor {
       return;
     }
 
-    var data = _ArgumentData(node.argumentList);
+    var data = _ArgumentData(node.argumentList, context);
 
     if (data.additionalArgumentsFound || data.positionalArgumentsFound) {
       return;
     }
 
-    if (data.hasDecoration) {
+    if (data.hasNonNullDecoration) {
       rule.reportLint(node.constructorName);
     }
   }
@@ -91,20 +93,25 @@ class _Visitor extends SimpleAstVisitor {
 class _ArgumentData {
   var positionalArgumentsFound = false;
   var additionalArgumentsFound = false;
-  var hasDecoration = false;
+  var hasNonNullDecoration = false;
 
-  _ArgumentData(ArgumentList node) {
+  _ArgumentData(ArgumentList node, LinterContext context) {
     for (var argument in node.arguments) {
       if (argument is! NamedExpression) {
         positionalArgumentsFound = true;
         return;
       }
-      var label = argument.name.label;
-      if (label.name == 'decoration') {
-        hasDecoration = true;
-      } else if (label.name == 'child') {
+      var name = argument.name.label.name;
+      if (name == 'decoration') {
+        // Not lint if decoration is null or nullable because a DecoratedBox
+        // only accepts a non-null Decoration
+        if (DartTypeUtilities.isNonNullable(
+            context, argument.expression.staticType)) {
+          hasNonNullDecoration = true;
+        }
+      } else if (name == 'child') {
         // Ignore child
-      } else if (label.name == 'key') {
+      } else if (name == 'key') {
         // Ignore key
       } else {
         additionalArgumentsFound = true;
diff --git a/test_data/mock_packages/flutter/lib/painting.dart b/test_data/mock_packages/flutter/lib/painting.dart
index 58158555b..5835ed6e1 100644
--- a/test_data/mock_packages/flutter/lib/painting.dart
+++ b/test_data/mock_packages/flutter/lib/painting.dart
@@ -2,4 +2,4 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-export 'src/painting/box_decoration.dart';
+export 'src/painting/decoration.dart';
diff --git a/test_data/mock_packages/flutter/lib/src/painting/box_decoration.dart b/test_data/mock_packages/flutter/lib/src/painting/decoration.dart
similarity index 90%
rename from test_data/mock_packages/flutter/lib/src/painting/box_decoration.dart
rename to test_data/mock_packages/flutter/lib/src/painting/decoration.dart
index 881503b90..8ab2445fb 100644
--- a/test_data/mock_packages/flutter/lib/src/painting/box_decoration.dart
+++ b/test_data/mock_packages/flutter/lib/src/painting/decoration.dart
@@ -2,4 +2,4 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-class BoxDecoration {}
+class Decoration {}
diff --git a/test_data/rules/use_colored_box.dart b/test_data/rules/use_colored_box.dart
index 3c90df244..e2235e34d 100644
--- a/test_data/rules/use_colored_box.dart
+++ b/test_data/rules/use_colored_box.dart
@@ -7,9 +7,7 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 
-class Color {
-  Color(int value);
-}
+class Color {}
 
 Widget containerWithoutArguments() {
   return Container(); // OK
@@ -23,7 +21,7 @@ Widget containerWithKey() {
 
 Widget containerWithColor() {
   return Container( // LINT
-    color: Color(0xffffffff),
+    color: Color(),
   );
 }
 
@@ -43,13 +41,13 @@ Widget containerWithKeyAndChild() {
 Widget containerWithKeyAndColor() {
   return Container( // LINT
     key: Key('abc'),
-    color: Color(0xffffffff),
+    color: Color(),
   );
 }
 
 Widget containerWithColorAndChild() {
   return Container( // LINT
-    color: Color(0xffffffff),
+    color: Color(),
     child: SizedBox(),
   );
 }
@@ -57,7 +55,7 @@ Widget containerWithColorAndChild() {
 Widget containerWithKeyAndColorAndChild() {
   return Container( // LINT
     key: Key('abc'),
-    color: Color(0xffffffff),
+    color: Color(),
     child: SizedBox(),
   );
 }
@@ -70,15 +68,49 @@ Widget containerWithAnotherArgument() {
 
 Widget containerWithColorAndAdditionalArgument() {
   return Container( // OK
-    color: Color(0xffffffff),
+    color: Color(),
     width: 20,
   );
 }
 
 Widget containerWithColorAndAdditionalArgumentAndChild() {
   return Container( // OK
-    color: Color(0xffffffff),
+    color: Color(),
     width: 20,
     child: SizedBox(),
   );
 }
+
+Widget containerWithNullColor() {
+  return Container( // OK
+    color: null,
+    child: SizedBox(),
+  );
+}
+
+const Color? _nullableColor = null;
+
+Widget containerWithNullableColor() {
+  return Container( // OK
+    color: _nullableColor,
+    child: SizedBox(),
+  );
+}
+
+final _nonNullColor = Color();
+
+Widget containerWithNonNullColor() {
+  return Container( // LINT
+    color: _nonNullColor,
+    child: SizedBox(),
+  );
+}
+
+Color? _getColor() => null;
+
+Widget nullableReturnValue() {
+  return Container( // OK
+    color: _getColor(),
+    child: SizedBox(),
+  );
+}
diff --git a/test_data/rules/use_decorated_box.dart b/test_data/rules/use_decorated_box.dart
index fbf4e511d..8a3cc783a 100644
--- a/test_data/rules/use_decorated_box.dart
+++ b/test_data/rules/use_decorated_box.dart
@@ -20,7 +20,7 @@ Widget containerWithKey() {
 
 Widget containerWithDecoration() {
   return Container( // LINT
-    decoration: BoxDecoration(),
+    decoration: Decoration(),
   );
 }
 
@@ -40,13 +40,13 @@ Widget containerWithKeyAndChild() {
 Widget containerWithKeyAndDecoration() {
   return Container( // LINT
     key: Key('abc'),
-    decoration: BoxDecoration(),
+    decoration: Decoration(),
   );
 }
 
 Widget containerWithDecorationAndChild() {
   return Container( // LINT
-    decoration: BoxDecoration(),
+    decoration: Decoration(),
     child: SizedBox(),
   );
 }
@@ -54,7 +54,7 @@ Widget containerWithDecorationAndChild() {
 Widget containerWithKeyAndDecorationAndChild() {
   return Container( // LINT
     key: Key('abc'),
-    decoration: BoxDecoration(),
+    decoration: Decoration(),
     child: SizedBox(),
   );
 }
@@ -67,15 +67,49 @@ Widget containerWithAnotherArgument() {
 
 Widget containerWithDecorationAndAdditionalArgument() {
   return Container( // OK
-    decoration: BoxDecoration(),
+    decoration: Decoration(),
     width: 20,
   );
 }
 
 Widget containerWithDecorationAndAdditionalArgumentAndChild() {
   return Container( // OK
-    decoration: BoxDecoration(),
+    decoration: Decoration(),
     width: 20,
     child: SizedBox(),
   );
 }
+
+Widget containerWithNullDecoration() {
+  return Container( // OK
+    decoration: null,
+    child: SizedBox(),
+  );
+}
+
+const Decoration? _nullableDecoration = null;
+
+Widget containerWithNullableDecoration() {
+  return Container( // OK
+    decoration: _nullableDecoration,
+    child: SizedBox(),
+  );
+}
+
+final _nonNullDecoration = Decoration();
+
+Widget containerWithNonNullDecoration() {
+  return Container( // LINT
+    decoration: _nonNullDecoration,
+    child: SizedBox(),
+  );
+}
+
+Decoration? _getDecoration() => null;
+
+Widget nullableReturnValue() {
+  return Container( // OK
+    decoration: _getDecoration(),
+    child: SizedBox(),
+  );
+}