These will work for fantasy and Cthulhu mythos style stuff. I love the lopsided look to the last sculpt. With the purported razor toothed grins, these beasties truly are the stuff of nightmares - all smiley and sweet to begin with and at the flick of the fingers they become your worst nightmare (well, that's what always happens to me - my dreams always turn to nightmares with some nasty split-second twist).
If you are thinking of moulding them for sale purposes, I'd be interested in a few.