One of the authors of the IKEA Hackers weblog wanted to use an IKEA Brimnes headboard in their apartment, but most of those are wall-mounted which wouldn't work for their landlord situation. The fix was made by using two IKEA Furusund table legs to make the headboard free-standing.
The Furusund table legs are wooden and fit into a metal base. All you need to do are cut the legs to size and attach the metal base to the bottom of the headboard. If I were doing this project, I'd probably also paint the legs to match.
Have you hacked furniture pieces to get them to work in a specific application? Let us know in the comments below.
Free-Standing Brimnes Headboard for Renters [IKEA Hackers]