The theme was the color blue and a bird sitting on a silhouetted branch. I made it with Unity3D, C#, Photoshop and 3DS Max, it was really fun! There were tons of great games made and there were even two teams of 12 year olds who made better games than I did, but that's not surprising, just hearing their ideas showed how much creativity they had.
I thought I’d link to the video of all 12 hours of its creation squashed into 8 minutes! If that’s the kind of thing you’re interested in you can see it on Youtube
Hope you enjoy it and if you get even 10 seconds of fun out of it I’ll consider it a success =D