I'm not very adept at doing pranks and bragging fellow, but the suggestion given by this video is very tempting! ahauahauhahauahau

Look. If you have an annoying co-worker to the cube, and dying to relieve the boredom a good ready for him, like a plant bushes on the keyboard it then you will only need a couple of weeks, a spray of water and seeds grass for cats (never knew you had it ...). The bid is to take the vacation of their colleague. And when he gets back to work, you will find a small reserve of plant life growing on your keyboard.
That's what I would call slutty environmentally friendly!

Via Oink!