not sure there is a site for that. I know theres one from wow where it showed your level, hp, mana etc... on a sig, but there has to be a site dedicated to that. Also if im not mistaken there would have to be a database it could update from for your sig, like wow has the armory. Not entirely sure if thats 100% how it would work, but that would have to be my best guess.
The best suggestion I can give would be to learn how to make sigs in photoshop and keep your own up to date :). They take some time to make if you get really into it, but its lots of fun at the same time. If i get that bored one day, maybe i can make you one.
Wish i could find one i made for a friend in wow, i loved it lol, thought it was the best sig i have done. I will keep searchin for it to show ya. but if you want to get started, heres a site to get the basics.
http://www.sigtutorials.com/
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