Robert, one critique I have of those two negatives I posted is that they aren't quite abstract enough for my liking, but I am workign on it. Those two were done with normal plain-Jane neg film, fuji pro s and pro h as I recall. So they were scanned, the scan software removed the mask, and then instead of flipping them to positives I simply kept them as negs.
I have a much better method now. I have located some maskless colour neg film, the digibase stuff from Agfa. With that, the neg you get form normal c41 process is good to go. It can be scanned or it can be projected or ilfo'd or whatever. So I am eager to play with that more. I am also wondering about x-processing this digibase. Anyway I have some 'flipped' digibase stuff in the normal galleries; as positives these images have some quite interesting colour rendition:
(there was a url link here which no longer exists)
(there was a url link here which no longer exists)
If you'd like to use the examples then at least let me come up with some better scans, these annoy me quite a bit!