Assuming you mean a form or forms in your database, yes, through the forms designer (design view, usually in the upper left corner). If you mean part of the Access application itself, you can change colors and fonts through the Windows interface settings.
Yes forms on my application, The form's tab that is the container for the form's caption. All I see in the properties sheet is where to name the tab but nothing about changing the color of the text, or changing the little icon next to the text (caption)
I understand what you're asking now. The answer is that is a Windows function and will affect most Windows applications. It cannot be done within Access.