Being the dinosaur-nut that I am, I've tried several times to come up with a Prehistoric series...my only problem is they come out as nothing more that dragons every time. I'm of the opinion that maybe 1 or 2 could slip by, but otherwise? I might avoid that category altogether.
I'd also like to point people toward Japanese and other Eastern legends. Also a good source of inspiration. The idea of Kami, for instance, lends some intrigue. For that matter, the whole Shinto practice is absolutely littered with fantastical ideas and wondrous creatures with strange abilities.