You can enable Media Center to automatically add colour to the guide based on the genre of shows in the guide.
To do this:
- From the main menu of Media Center, under Tasks, select Settings.
- Select TV.
- Select Guide.
- Select Guide Page Options.
- Enable the checkbox for "Apply colored backgrounds to shows, based on their category".
Done, now when you go into the guide it will be coloured based on the genre's of the shows themselves.