Sure, we probably all dream of having a Carrie Bradshaw-style custom closet. But those things are expensive. Really, really expensive. For all the rest of us, 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. It’s BILLY! The world’s most versatile bookcase, it turns out, makes for some pretty great closet storage as well.