I was looking for a quick (cheap) table top dolly for my GoPro so that I could get those cool slider like shots. A quick hunt through the Lego basket yielded a find. It was a Lego car at one point but I re-purposed it and I am in the process of recording some shots with it. So far it works really well. It will also fit in a hot wheel track in case I want to take it outside.
You could also modify it so that it could accept a smart phone or a small camera.
Sidd