I noticed this article on Make the other day, it is a robot arm for drawing cartoons.
It uses an Arduino for control, so nothing special there then, but what caught my eye was that this one uses Meccano and not the ubiquitous Lego Technic that these things are normally made from.
Over the years I have accumulated quite a bit of Meccano, and it has been languishing in the garage for several years. I was about to put it on e-bay as a job lot but this has made me think again :-)
For full details of this arm go to Acorv's blog page