After reading this thread, I'm left with the impression that you're the prick, and your "friend" is really the good one...
You appear to be so immature that you can't man up and talk with him about it. I mean, 95% of all "bullies" don't even know they crossed the line (which is a silly picture in your case, that's also something you should think about). Instead of getting over it, you're asking us to come up with a master plan on how to embarrass him (since you can't come up with something yourself). You're probably thinking you'll gain popularity from doing this, and that he will respect you. That's not going to happen. You're not going to become a "cool kid" for messing with him, rather the opposite. You'll lose respect among the normal kids, but you won't get any respect from the bullies. They'll probably just think that point where you can't take the bullying anymore. That will just make you a more attractive target in their eyes. So the best idea is to just forget about it. Seriously, it's not worth it.