Claymation's pretty fun and relaxing. There's a lot of nice mobile apps to play around with. These took a couple of hours.
Here's a claymation I did for a 2 day 'Candy Jam' at King. I worked with Martin, a Tech Artist. It turned out pretty great considering the tight deadline and it was cool watching it up on a big screen with a crowd. We used a SONY a7 with Dragonframe and After Effects.