After the padding on my Razer m250s started to peel away, I wanted to repair them and make them more awesome.  The padding was reinforced with leather and replaced entirely on one of the pair.  I then foiled the outside part of the headphones with silver foil, and added some large gears and tension dials from my collection of watch parts.  I varnished the whole lot a couple of times, so everything is nice and secure (the foil tends to flake off otherwise).  They're just as comfortable as before, and the sound is still great.