My favorite was one of my most recent; I just liked it because it was a challenge to get everything to work right & it ended up turning out pretty well - "Black & Blue" http://www.joedios.com/dioramas/sho...&searchid=67247

And, while not very dynamic, I was really happy with how my modification of the Cobra Deviant came out - "Cobra Deviant, Urban Combat Variant" http://www.joedios.com/dioramas/sho...&searchid=67247