My avatars, like most, have always represented my interests. My first avatar for the longest time was of a unique picture I took while in London...an alley surrounded by buildings and a rather out of place tree among them (Architecture & Photography). On my 1000th post I changed it a couple times, but I was trying too hard to come up with something different that didn't look out of focus. My current avatar represents my other passion, CARS! Will it stay that way, probably not, but for now...it's M3 all the way!
Signatures on the other hand are fun...hence a blend of what I love...fine cars and fine women! I think in my case, it shows that I've become more comfortable with my community and friends. I'm happily married but that doesn't mean I can't look at the menu...it simply means I can't order!
Cheers!