We probably all dream of having a Carrie Bradshaw-style custom closet. But those things are expensive. Really, really expensive. As an alternative, there’s a trusty IKEA product that will give you the look of custom shelving, for a fraction of the price. You may have already guessed what it is. The product is called Billy: the world’s most versatile bookcase, and it turns out, makes for some pretty great storage closet as well.