[Nikelaos]

The sprite dumps might be a good place to look, that way you can search through many possibles at once. You never know, you might come across a unit you never knew existed or hadn't thought about, and you might find you'd like to chuck that in.

I believe there's a link in the stickied sprite editing tutorial. You'll want to head there anyway if this is your first mod because it can be alot of help in making yourself the sprites you need.