It's difficult to add colour and decoration to the office in your apartment without pissing off your landlord, but Flickr user Maumusica's studio is a neat example of how you can decorate with light. Not only do the LEDs on the equipment help to create a nice look, but additional colour is added with coloured LED backlighting behind the computer monitors. If you can't paint with paint, paint with light!
Be sure to check out the full set of images to get a better look at the well-designed workspace on the whole.
New Studio Setup [Maumusica on Flickr]