One thing that I like is Haiku....so I'll try having Haiku Wednesdays for each game's forum.
The best Haiku (contemporary 5-7-5 syllable style) wins 100 gems. Winners are selected by me (right before the next week's Haiku) and are heavily influenced by forum feedback...keep in mind I like the funny and the creative.
I'll start it off easy:
Kingdom Age, Rage! Rage!
Dragons, Monsters, fight them all
Battle others now!
Good luck!
-er
EDIT: Any scores I give are rough/tentative scores and do not determine the winner (but higher scores will usually win)