Prepared Guitar Blog Spotlights "Prepared Guitars"

[Chrome Dinette]

http://preparedguitar.blogspot.com.es/2014/10/prepared-guitar-photo-archive.html

 

[KRosser]

http://preparedguitar.blogspot.com.es/2014/10/prepared-guitar-photo-archive.html

Other than Harry Partch, there's a whole bunch of names I didn't know...for me Fred Frith is the godfather of that genre...

 

[Chrome Dinette]

I think much of it is reader submitted, though there is some historic material such as Partch.