i like the idea...but the only problem i see is that the cafe limits the sig to 100 pixels high (see my sig). his hands are so low in the picture that im not sure you could get it to work unless you made the picture extremely small (you have to figure you would want a little under his hands up to at least the top of his face in the sig)...in which case your name between his hands would be even smaller.
example...heres the picture at the largest height allowed:
if thats cool with you with things being smaller, i could bust this out. im a bucs fan myself (before the ravens existed) and a phillips fan...so ill hook it up. if you have some other ideas let me know. as long as you keep it to one/two players max. i dont do sigs with tons of guys anymore