I have no .gif-animating software, but in terms of ideas:

“It’s always Caturday…” (Permanoob image) ”...when you’re a Permanoob!”

“Sick of your SUCK-bum PARENTS?” (Emo Kid image) “Let Forumwarz help!”

“Help a brother out…” (Ravit’s avatar) “Play Forumwarz!”

“FORUMWARZ! No homo.”

“It’s not gay if you say ‘no homo’...” (THE_****’s avatar) ”...on Forumwarz!”

“Forumwarz: the game where you can win internet ice cream” (accompanied by pictures of scoops, naturally)

Also, you could probably do something very…attention-grabbing with the Camwhore attack pictures. Maybe a tit shot accompanied by “This could be you!”