Ok so its really simple everyone just post their favourite or best converted models that YOU have made.
I saw a thread similar up on another site a while back and it was HUGE. I think heresy has a crap load of talent and I think we can make a crazy long thread with all the conversions people have done over the years.
They don't need to be crazy complex, painted, or even primed but try and make sure the pictures do the models justice!
I will start with my all time favourite that I did early this year.