I've been looking into the newly released HeavyCoin, which uses 4 well known hash functions
(SHA-256, Keccak-512, Grøestl-512, BLAKE-512) plus a new one called HEFTY1
They claim it's CPU only, which I might actually put to the test.
Christin
Nice that your taking my suggestion

Good luck, i wish i could help, but im still teaching myself. Any tips on C++/CUDA?