Got a few boxes of plastic soldiers for my birthday (I can't beleive how happily my friends indulge in my nerdiness... ).
With all that new raw material I decided to finally have a swing at a truescale marine (apparently they're all the rave these days...). He's made using terminator legs and the rest is normal marine parts. I've added small discs of plastic at the arm joints and where the hands meet the armour though to bulk him up. The hands themselves are also terminator size from the GK termie kit.
All in all a pretty quick and surprisingly effective conversion.