No matter how nice the pads, some rental buildings have very ugly legacy items in plain view: intercoms, doorbells, even exposed electrical boxes. Home improvement website Unplgged has an easy solution for covering them up.
All you need for this project is a few cupboard hinges, some screws and a Molger mirror from IKEA. Depending on how far the electrical unit in question protrudes, other things might work — regular mirrors or pieces of art, for example.
I simply mounted the mirror backwards in the frame and used the base piece from the second pack as a replacement top piece (since Ikea has it designed that you slide the mirror in from the top afterward so for our needs the top lip would have been missing). I bought some hefty cupboard hinges from a local hardware store and a little metal L-bracket and mounted the mirror to the wall. The hinges are more than strong enough to hold the mirror but I use the L bracket to hook the mirror on when closed so as to make sure that it is level. So now it just looks like a chunky mirror yet we can open it up. . .when we need to.
Note that this isn't necessarily such a great idea for certain eyesores — like, say, smoke detectors, since they need to be in open air. It should, however, work pretty well for other ugly units hanging on your walls.