It is incredibly easy to build a compost bin out used pallets. This is one pallet project that won't require you to disassemble them, which is a frustratingly impossible task. My compost bin is made of three pallets and an old piece of sheet metal. Simply wire your pallets together, drive poles into the corners to hold it in place, and top it off with a board or piece of sheet metal to create a handy garden storage area. You can also add slats to the front to make it look custom-made if you want to go the extra mile. However, the slats should be removable so that you can shovel it out when it's done "cooking."