I'm not sure why this didn't occur to me before, but how about the logos of the different factions in the game? Brotherhood of Steel, Enclave, NCR, Ceaser's Legion, etc. They all have a smart little logo, along with lots of the smaller groups, companies and locations.
Also, it looks like you responded to my other post while I was editing it. Any way to get the 12 teeth on the vault logos, or can't SP do details that fine?