I'm assuming this would be easy enough for someone capable of setting up and maintaining a forum like this.
My idea is for a new set of smileys to add to the existing ones:
X, Y, A, B, Circle, Square, X & Triangle. As you know, our controller buttons in coloured circles.
You could go further with LB, LT, Back, Start etc. but the main few would be very handy.
Below is some artwork that may be of use:
This was a quick search. I have no idea about permissions.