I read it somewhere here on the forums a while back but I can't find it. You could probably mix a couple and get some hybrids, but most of the time they will end up being brown.
Edit: You can try it, here's some examples of it working pretty well. Apparently they are fertile.
If you cross to Neocaridina heteropoda variations they don't become sterile after all
RAOK Club #77|The Fraternity of Dirt #112
Last edited by Monster Fish; 10-12-2012 at 12:37 PM.
Reason: added something