Completely off topic, but if you are looking to add motion to your timelapse, Sainsbury's supermarket in the UK are doing a special offer on clockwork kitchen timers for £1.80 (was £7.00)
This video gives the basic idea.
https://www.youtube.com/watch?v=eApGSCB5Wpo .. results should be similar to the motion seen in the early part of this video..
http://chdk.setepontos.com/index.php?topic=8814.0.. and here is the timer in question.
It has a very satisfying tick, and rings a bell when your timelapse is cooked.Oh... and it has a large magnetic base, so you can stick it to... pretty much anything made of steel.