Likely you will find that you need to either edit or create new images. Many of the skin elements consist of images that are used in different places.
Helpful and Handy Links
I am in RH 8 and changed the skin called "blue and yellow text only" with the skin editor to the branded colors for my company.
If you have access to this skin, and RH7 allows you to edit to colors, then you could solve your issue that way.
As Captiv8r/Robowizard (Rick) notes, if the skin has multiple images in it, you are out of luck, but the one I note is plain text.