I use them to make chocolate beet cake. No flavor of beets, but so moist, you won't believe it! There are lots of recipes out there and I've tried several.
Here's one of my favorite: (even our friends who "hate beets" love this cake!
http://whippedtheblog.com/2007/02/23...et-ingredient/
To try more, just do a search for "chocolate beet cake recipes"