I wanted somewhere to hold my keys that wasnt inside my desk as they'd get lost with all the other crap in there, so I made this little key hook that anchors onto your top desk draw of your malm desk!
It should be noted that I have 2 IKEA malm desks and the heights of the draws are different by a factor of about 1mm, so if you find it's too tall, you can print off a small little 1mm thick square and glue it to the inside bottom of the holder and it should fit nice and snug :)
Thanks!