When I first started at my current job, I was out sick for a couple of days and came back to my office totally re-arranged as a practical joke. Pictures were upside down, glasses taped to the desk, shoes hanging from the ceiling, and about 100 other small re-arrangements.
It took a while to get back at one of the instigators, but the opportunity finally arrived :) Deanna went on vacation last week!
A while back I had seen an email where someone’s desk was “foiled” and really liked the result. Total project time about 2 1/2 hours. So here it is: (all picts at flickr)