You probably don't give shopping carts much thought. And honestly, we don't blame you. We shuttle them around the store, throw groceries in and then forget about 'em when we leave (often with the cart left somewhere in the middle of the parking lot).
Sometimes though, that grocery cart is reused for a completely different purpose. We've found that people can get kind of creative with these things; some even make money off of abandoned grocery store carts.
Click through the slideshow to see how you can make a bike, or even a Christmas tree, out of a cart.