"Malma" is the name of a mirror that you can buy at Ikea - this one, to be exact:
Ikea hacker emulsion mirrors (look at the bottom of this post for more Malma links)
Headboard made of Malma mirrors
Paper mosaic mirror
Another paper one
See what I mean? They go on and on, and none of these are the one I started out looking for!
(Note: if you google this like I did, you will also find lots of posts for "how to hang a Malma mirror" - apparently there's a trick to it. Or, you can use adhesive squares like the person who made the headboard did!)
I also love this mirror from Cathie Filian, which is a hack of a different Ikea mirror!