Duneflower
Warlord
Pretty sure I ran across a Texas civ a while back, so I got to thinking, maybe it'd be fun to include them and maybe any other similar joke-ish civs - after all, they were an independent nation briefly, and their culture is markedly different from pretty-much any other area in the US! I also think I ran across a California civ or at least talk of creating one a while back, so I'll include them in this as well. If you have any specific suggestions besides those two (link if possible) or wish to second one already suggested, be sure to make note of it!