Attached is an Access 2010 app that will allow you to customize the colors of all the forms in your app in a consistent fashion. This can save you literally dozens of hours over trying to modify a bunch of forms manually. The app has 70 preset schemes that you can modify (if you don't like the presets).
You will need to copy the objects and a code module from the app into your project to try it out. Try it on a copy of your project first to be safe. When you are happy with the results, you can delete the objects and module from your project. After its done its job, it isn't required to stay in your project to retain the colors.
The app is all VBA, no macros. It will work OK with your forms that contain embedded macros.
If you have existing code or macros that manipulate colors, undesirable conflicts may or may not occur.