Cookie Cutters
At this point, we can all agree that aluminum foil is the holy grail of DIYs because of the versatility of its material. The fact that it can be molded into any shape makes it possible to be used in many ways.
Another thing a foil can be used for is as a cookie-cutter. Not only is this easy to make, but it is also cheaper than an actual cookie cutter and you can be as creative with shapes as you want, from stars to unicorns. Simply tear some foil and move it around to create your desired shape.