You can do anything you want with the colors. You can do nearly anything you want with the screens, including rearrange the items on the screen, change fonts, add/remove screens, or create custom screens. You can really make it YOUR mod. In fact I made mine mostly black and white. My cursor/selector is set as purple but it really looks more like a dark blue on the real screen. Also I made the text Yellow when that field is in edit mode.
Here is what my main screen looks like on my 75C. In the left pic the watts are highlighted by the cursor but not selected for edit, on the right it has been selected for edit. This is essentially just a recolor of the UI DJLsb put out.
You can also check out LOTS of themes other people have uploaded here: DNA 75 Color Themes
I don't like most of these which is why I made my own, but maybe you will find something you like, or you can make your own as well. If you really want mine I can upload it I guess.