A good way to recycle aluminium cans is to make cookie cutters. They are very easy to bent (but be careful, very easy to break), can be made any shape and they cut very well.
I was obsessed with the image of a cat on a roof under the moonlight, mainly because of my childhood cartoons, but because I found their curves so soft and soothing.
See here a bit more details about recycled can into cookie cutter.
Be careful they are really sharp.