I just dyed my grubby official grey bumper
I had bought the official grey bumper case only to ask for a refund a couple of days in as the case started staining almost immediately. I was given a quick refund and told to keep the case anyway.
Since it was now free and I don't like grubby, I thought I would experiment.I bought some Rit dye from eBay for £3 and dyed the case a darker grey. The case started turning navy pretty quickly but the lip of the case took a long time in the dunk tank to take the dye properly (must be slightly different material to be more flexible when fitting the case) so ultimately the case finished up a dark charcoal grey, almost black but not quite. It is actually very nice. I might put up some photos...but if anyone is in the same boat and curious, the official bumper can be dyed, it just takes 2-3 hours in Rit dye.