I find this idea quite interesting.
But to be honest, I feel the badge could be better in just one way: legibility. It's quite interesting, the fact that it uses the forum's colors and all, but I just can't read the contents! I guess it's Pokéspriter, but I don't know if an outsider will guess the same... Also, I feel it's too soft: it won't draw attention! And we need attention. =)
Now, the other important part of criticism: praise! The idea of using the same colors as the forum's themes is quite interesting! The button serves as a door to the Forum, so it needs to match its theme! Also, the very idea of making a badge is very good, as it allows some discrete advertising. Hey - it works for Coke and Pepsi, why wouldn't it work for us?
Anyway, I'm looking forward to seeing the new versions of the badge!