There is a color selection top of screen just left of middle.
You can also change by body, by feature or by face.
What a clear/detailed question..
color of what? where?
Good thing JD just got that new mind reading hat in the mail.
By default, all features within a part inherit the "color" style associated with the part material.
As you model your part, you can change the color of individual part features.
When you place a part (or subassembly) into an assembly, you can redefine the color of the part occurence within that assembly.
Look at the iProperties menu.
oo.. gsmith9810 got a mind reading hat too.. I feel left out.