Here's a nice little project for the weekend, provided you've got access to your cubicle. These are pretty decent instructions for building a bike rack for your cubicle.
The end result is a 1x3 board with a wall-mount bike rack screwed into it. The board is secured to your cubicle wall with standard 1" backpack webbing. You tighten the webbing with a standard cam-lock or fastex buckle.
Between painting/staining your board and using colored webbing, there are plenty of ways to make this either blend in with the drabness of your cube, or flex your "design on a dime" skillz. You'll be the envy of your officemates, no doubt.
Might wanna clear that with the boss first, though.