Did someone create an avatar set? I seem to remember one, but can't find it in search. And it seemed a really good theme.

I love Avatar. It would be a difficult theme, though. All of the elements fit in , so finding a place for and might be challenging.
I wonder if, for such a set, earth benders could be . Maybe air benders could be and fire benders could be . Where does that put water benders? ? Perhaps ?

I'm always fascinated to learn how other people would assign things to colours! It tells me a lot I hadn't thought of. I was going to go:

Earth: G
Water: U/w
Air: W/u
Fire: R
Spirits: W, B, maybe other colours
Animals: All colours

And I'd put some bad guys in B, though I don't think firebenders in general are more B.

I thought that worked fairly well, both philosophically and mechanically. But I couldn't think of any good mechanics: I considered having element subtypes, but couldn't think of anything to do with them and wanted to avoid the "arcane" problem.

I'd have G under water benders, though that's because of plant bending. I'd do Earth: G/r, Air: W/u Water: U/w/g Fire: R/b. I guess it depends on what location you were looking to source a card from too. The Northern Water Tribe feels U/w while the Foggy Swamp Benders feel U/g. Ba Sing Se would eel W/g while most unnamed Earth Kingdom villages would feel closer to G/r. I put b in the Fire Nation because I took selfishness in the form of "I'm doing this for myself" as a spiritual element of learning firebending.

Gah, this reminds I still need to get on with finishing Korra.

Oh yes, I think I was going to count swamp bending as G. And bloodbending as B.