How to Give a Color to a Box in Simulink
- 1). Launch MATLAB, and then click on the "simulink" shortcut in the application's toolbar to start a new session of Simulink.
- 2). Click on the "Open" button in Simulink's toolbar to load model or select an object from the application's "Libraries" window.
- 3). Click on the block or object you'd like to color. Click on Simulink's "Format" heading, and then select the "Foreground Color" option.
- 4). Select the desired color for your block from the color palette window that appears. Click "OK" to apply the color your block.
- 5). Select the "Save" option from Simulink's "File" heading to save your changes.
Source...