Here are two things for your Gamma World file.
This one I stumbled across back when the Ukraine news was protests and street violence not impending World War III.
Wired: The Brutal DIY Weapons of the Ukrainian Revolution
This next one the artist and my sometime DF gamer andi jones passed on to some of us by email and I had to share.
Artist Coby Kennedy Transforms Brooklyn Street Signs into Post-Apocalyptic Weaponry
This artist is very much showing the Jim Holloway influence, there:
I figured I'd share them but they're really inspiration for when we eventually foray into Gamma World.
For even more post-apoc art, check out andi's tumblr, Black Ray Gun.
I do (or andi does) need to get a Gamma World game going with GURPS.