craftgrrl | adhesive question!

I made these melted-toothbrush toothbrush holders (from Readymade a few months back) but I don't know how to affix them to the wall!

In the magazine they epoxied suction cups to the back, but I don't have tile walls in my bathroom. Any ideas on what I can use to stick these to the wall, that won't destroy the wall when these (eventually) come down? I think a small amount of something used on the bristle part of the spiralled toothbrush would do the trick... it just needs to be strong and able to stand up to steam.

Suggestions? Thanks in advance!