I don't think I'd give up my oddball pentagonal thingy. It's as good as a custom avatar, because it's so... odd... ugly... strange... that no one else wants it. It suits me.
Actually, I once considered taking it, but then I noticed that the avatar I love (Civ2 Musketeer)
was unused so I changed my mind. Btw, that one is a 'fortfress' -unit,
from a very bad Civ2 US Civil war -scenario.