I don' think this is exactly what you're looking for, but Domainr is my favorite place to try a bunch of different domain ideas. Does a good job of finding options you might like using all the weird domain types.
Maxim Ananov- Distraction Dimmer • HazeOver.com
I always turn to it when I get an idea
Jack Dweck- Product Manager at Unroll.Me
I use Domainr to search for domains, and then use Namecheap to purchase/manage them.