Very cool flash game
 

It's called Line rider. It's a fully interactive game where you draw lines and create a track for your little guy on his toboggan. Do a search in Youtube.com for various videos for inspiration.

Be ready to loose hours of your day with this thing.

http://www.deviantart.com/download/46455834/

been playing for 2 mins and i'm already doing the "wooooooooooooo!" sound effects as he's going down the hill. haha!

I like the one I posted since you can draw straight lines and erase lines you don't need or make wrong.