I used Blender. It took me about 4hrs. I used a blueprint of the bunny from the net. I'm a newbie so don't get angry if it's bad. The idea came to me suddenly. On my first try the armature of the bunny wasn't right and blender crashed suddenly. God's wish I guess. Second try I finally got what I wanted. There are a few imperfections in the bunny, but I tried to hide it as much as I could.
By the way, I'm 14 :)
