I'm mostly retired from ML customs these days but couldn't resist making a quick Widow after I ended up with a cheap Shriek. Removed all the white paint, hit it with a gloss varnish and gave her a couple of heads (from the Deadly Origins & Riders figures), a few sets of hands, some different gauntlets and a shitload of guns.

So simple I'd be surprised if Hasbro didn't do the same thing sooner or later!