40k vs Life

One of the cool things I like about 40k is the opportunity to make your own models (or conversions).  There is a thriving business that caters to the bits and pieces needed to construct custom units and even create new ones like titans and flyers!
The way I see it, the more you get into the game, the more of a statement you want to make.  At first it starts with a unique leader or vehicle.  But soon it grows into whole units and squadrons of vehicles.  This is what makes this game more challenging in many respects to other games of this genre.  The thought and effort put into each piece brings a new level of enjoyment to the whole experience. 

My DA Company Champion , I don't use him much but when I do he does stand out...


Another conversion, wanted to make a squad of these guys but parts are dear...


So what are your favorite or most effective conversions to date?

Cheers and Happy Hunting