I think a smallish, peacock-feather, with a lot of colors would be really cool and nice looking. I'm a fan of behind-the-ear. Foot tattoos are really cliche these days and I hear very painful. Although behind the ear isn't going to feel good either, I think it's a more interesting spot. However, when doing something small, if it's very detailed it won't come out right. Here are a few examples. The last being very abstract.





