Yes. Lots.
Often 3rd party skins come with additional color schemes, and many more are available at sites that specialize in such things such as igo8navigation.
You can also, with a little time and practice, make your own. Copy a {scheme}.zip file from the Content/scheme folder to your PC, open it, and you will see color.ini. It's a simple plain text file that defines all the colors for the various elements. Once you figure out what's what, you can change the colors to whatever you want using standard RGB values that can be determined from here if you are not familiar with them:
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