Forget "take a minifig to work day", I always have Lego at work. How much Lego? A LOT of Lego. Take a look. This is almost all of it, I haven't had a chance to hang the rest of it off of the ceiling yet. Click on a pic to see the fullsize.
This is one of my custom dragsters on an 8735 motorized cradle I built. The dragster snaps onto the cradle, meshing the gears. It is very easy to remove the dragster as it is only held on by a total of 8 studs. This makes it easy to swap the yellow dragster on if I wish. I'm building a grey dragster with clear cylinders and red pistons next, for more effect when running.