So, I know you guys like Super Smash Bros. Brawl built around ponies - how about ponies inserted into Brawl? Spearheaded by turbobear, this project currently includes several skins for Rainbow Dash (including Scootaloo and WonderBolt) and a variety of moves. While it's far from finished, you can download the current build here.
The project is currently in growth mode: the team is looking for an animator, a modeler, and an additional code monkey to finish up Dash and begin work on the rest of the Mane 6. If you're interested, or just want to follow the project, the official thread can be found here. Have fun!