Forget useful accessories for your desk and instead invest in one or more of these funky little critters.
The Hexbug is a little creepy-crawly robot (6 x 5 x3.5cm in fact) with touch sensors on its feelers and a built-in microphone. Upon hearing a loud noise it will scurry away in the opposite direction, and any time it makes contact with something it will step back from it.
Hexbugs come in black, amber, blue, green and red, and are much more hygienic than introducing a bunch of real insects into your home.
£9.99 each from I Want One of Those