In the '70s, Nancy Rexroth used an original Diana. I don't know if Holgas even existed.
http://www.wirtzgallery.com/exhibiti...09_images.html
http://query.nytimes.com/gst/fullpag...51C1A9629C8B63
http://www.robertmann.com/exhibition...oth/press.html
(select 'view exhibition' to see images)

And of course so much of the 'art' work from the late 1800s and early 1900s had many of the qualities of Holga work.