In addition to the thumbring, I have a bronzed octopus necklace and a starfish headband. It only makes sense that I've developed an enormous crush on Erica Klein's designs:
I love that the ram is actually subtle and, if worn among a mess of bangles, would require a second glance for recognition. My favorite, though, is most definitely the lion door knocker ring. It's extremely quirky, very unique, and would make my mother question my taste. There are more options on her website here, though the upgraded materials (emeralds, 18K gold, etc) make for higher prices than on Shopbop. If you can afford the better quality, by all means, go for it. If you're a junior in college with no money making prospects in the near future, spring for the cheaper versions, which are just as lovely.