Special mention goes to my Berzerker dreadnought - it was the first time in 15 years that I'd done a conversion; I had this idea in my head, a dreadnought with a juggernaut head, and I HAD to do it. I bought a blender dreadnought kit and a pack of Skullcrushers, JUST to get the juggernaut head (looking back, I've done this a lot since - this might be the point where it went south. :D )
Anyway, I still feel he's a good conversion, even 8 years after - I had next to no bits and had to use whatever was in those 2 kits I bought:
Here he is: