If forteana is evidence of natural phenomena that is exluded and ignored by the scientific establishment, then would 'fortean art' be any artist's work that gets excluded and ignored by the art establishment? But one thing art is supposed to be is the opposite of nature, is it not?
I think it definitely would be more than simply anything that is strange (strange to who exactly?) or artwork that just features forteana like UFOs.
The crop circle makers seem to regard themselves as artists. In fact, one of my favorite articles to appear in FT is 'Art & Artifice' by Rob Irving. (FT122, May 1999, pg38-41).
The intro reads: "Anyone who has looked into fortean phenomena knows that a real mystery is often accompanied by its fraudulent twin; for example, is crop circle-making art or deception? Rob Irving -who has made circles and felt the anger of those who feel his 'art' mocks their beliefs- claims deception is part of creation and a necessary part of both science and art."
If you haven't got it then I've just found this:
"Guerillas in the Midst? (2 Real Media Video files 15 & 22mins !)
Rob Irving, artist, writer and crop circle maker discussed exploring art, artifice and belief."
"Forays into other fortean areas have also been made by American artist Jeffrey Vallance, whose images of simulacra that occasionally appear in Fortean Times leave us unable to distinguish between artifice and reality, and Doc Shiels, whose sea monster photographs have much in common with the aforementioned UFO images. These art forms inspire a range of transfiguring interpretation and perception. Elevated from beyond their prosaic origins they are deposited in the realm of miracles, and otherworldly intervention."
P.S. Didn't Jeffrey Vallance have an article by or about him in FT years ago? I think it was about seeing forms like clowns in the marks on the Turin shroud or something.