This is my take on a UCS-style model of the Imperial Probe Droid from The Empire Strikes Back. Lot of fun (and occasionally frustrating) to build. It's an interpretation, really... the organic curves of the original probot's head don't seem particularly possible with Lego. But hopefully it's recognizable.
IPD - 1 by phil_memmer, on Flickr
For the set: http://www.flickr.com/photos/52288516@N03/sets/72157624657866407/with/4917011934/