Holiday in Ponyville
Holiday in Ponyville is a work in progress game, features the mane 6 ponies from the show. The game will consist of various mini games, one per pony for each day, and the more you complete in a day, the better! An example of a mini game would be helping Fluttershy with the rabbits or Rainbow Dash to keep the sky clear.
The game's programmer is currently looking for people to help and join the team. They are specifically looking for help with background and character's graphics. Though if your talent lies somewhere else, contact them anyway and see if there's anything you can do! Their contact email is hidaru@hotmail.it.
You can also visit the Ponychan Thread for additional info, and to keep up with the progress of the game: http://www.ponychan.net/chan/collab/res/7804.html
The mini game selection screen