lol, I could link you to better spriters than I, but i prefer to not be modest :p
I've made a Fire/Rock dinosaur starter, but I sprited him to big XD
I'll see what I can do. my starters were based off the dimetrodon for the fire/rock, an archeoperix for grass/flying, and a Baryonyx for a water/fighting. I could easily make the baryonyx a dragon/water as he is yet to be designed and I can make the grass/dark a raptor