One of the beauties of IKEA products is that their simple design also makes them endlessly versatile. While IKEA makes quite a few products specifically designed to house your shoes, they also carry lots of other products, intended for other uses, that can be pressed into service as shoe storage with just a little ingenuity.
This kitchen towel rail is also perfect for holding high heels, as seen on Stylizmo.
IKEA's Billy bookcase is great for your shoes, and pretty much everything else in your closet too. The blogger from Tatiana's Delights added doors to hers to protect her extensive collection of shoes.
IKEA's Ribba picture ledge, shown above, has been replaced by the very similar Mosslanda, both both are equally perfect for storing (and displaying) treasured footwear. (In this image from IKEA, the ledges are shown mounted upside down.)
IKEA's ubiquitous Expedit shelving, now reborn as the Kallax, is also a great way to organize shoes. The blogger from The Order Obsessed turned a couple of them into a shoe-filled headboard.
This kitchen rail, designed for hanging spatulas and measuring spoons, is also handy for adding a little extra shoe storage (in this case on the back of a door). Clever closet solution from Maria EMB.
This little guy, perhaps the most versatile IKEA product of them all, is happy to hold your shoes, as seen on Livet Hemma. Perfect for an entryway, or pretty much anywhere you've got a lot of extra footwear knocking about.