XIMAD has released a fun Christmas themed “Pandas vs Ninjas Christmas” variant of their popular game. This variant offers up Christmas and Chinese themes in the physics based Angry Birds-like gameplay. No word on how long this variant will stick around or remain free but it does support OS 7.0 which is nice and has 50 new levels.
You can pick up “Pandas vs Ninjas Christmas” for free in App World. They have also released Christmas updates for their Brain Cube and Bubble Birds games.