[photo credit: Craftster user Romey14]
Sadly, as of this month Ikea has discontinued the Fira, a handy little set of wooden box drawers that everyone loved customizing. I've got four of them myself, and while they were a pain to assemble--you'll got to nail each individual box together with nails that appear to have been made by nanotechnology--it is an infinitely useful sorting device.
Perhaps because it was such a basic, plain piece of kit, craftspeople, artists and designers would mod these things like crazy, as the internet will attest. Here are a few of our favorite Fira mods:
Flickr user onetomatotwo
Photobucket user ImAScrapbookNut
Damon of Crumley Family
Flickr user Virginia Ricardo
Flickr user rnjetta
Flickr user Karine Imagine
Flickr user Blue Cockatoo
To see even more, check out ikeahacker and this Flickr group.