Hello, RanchWife. 

There are several options to customize write checks in QuickBooks Desktop. However, assigning different colors is not available.

For now, you’ll get to know which account you’re writing with by checking it above the check image.

You can also request this feature to our developers through feedback. Just click Help at the top, select Send Feedback Online, and choose Product Suggestion.  

Don’t hesitate to reach us again if you have further questions.