A lot of people have been 'hacking' Ikea stuff into platforms for their hamsters. The
Knuff magazine files are good. All you have to do is lie it on its side and attach a ladder/steps up to it. Some people also remove one of the big sides so it is open to the bedding underneath.
Also the
BEKVÄM spice rack just has to be turned upside down to become a shelf. However it is a bit narrow.
You can leave either of these as plain wood or plasticote them so they are easier to clean