Hmm..I use Tinypic most of the time. If Tinypic isn't working I go with ImgUr.
Maybe you can try something like Photobucket or ImageShack. I don't know any more good ones as I rarely need another one :0
Hmm..about the sig from google. I'm not sure how to do the shape.
You can however, get a shape from google and use that as your background and make your signature on it.
I'm thinking of a gaming contest where everyone plays in split screen. It doesn't have to be multiplayer game. It can be a race or something. They can see how the others are doing and can talk to each other. Something like that. =\