Lightswitch plates and outlet covers are really easy to decoupage. This is a cheap and easy way to add some interest to a room, and can be changed back if you are renting and will need to move.
Reuse your current plate or buy the cheapest plastic ones at Home Depot/Lowes. Just give the plastic plate a light sanding before you start and you should be able to decoupage with no problem.
I like using mulberry papers and other papers with a lot of fibre in them and layering them (this also works well on glass). On this plate (which looks better in person than in the photo) I also added a gold leaf skeleton that I got from the scrapbook area at Michaels or Hobby Lobby. The scrapbook section actualy has lots of good papers and cutouts to use for decoupage projects.