It's been 30 years since IKEA designer Gillis Lundgren debuted the wildly popular Billy Bookcase ($89.99). The product is a classic, streamlined design that's been used to store everything from pantry items to novels, and has been personalized every which way in homes around the world. So to celebrate, IKEA France is running a promotion called Your Billy, where the bookcase's fans can send in photos of how they've DIY'd it to enter to win IKEA gift cards. The retailer has also released a limited-edition Billy collection printed with graffiti/doodle-style words, as well as a special anniversary book recounting the history of the bookcase, and some cute related products like "B" Bookends. IKEA US doesn't seem to be running the same promotion just yet, but the US is usually the last. So we'll stay tuned!