I'm not sure if everyone will buy into this - and I'm only floating it as an idea to see if there are any takers.....
However, how about next time we do a collaboration or print circle, we:
1) Take a photo and send a "straight" unprocessed scan (large JPEG or TIFF) of the shot to the next person in the print circle, then.....
2) The recipient crops and post processes it how they see fit (no holds barred - but I'm sure we'd all be respectful to the original photographer's sensibilities), then....
3) Post a copy on a designated thread and send a printed version back to the original photographer
Occasionally, I get a bit stuck with some of my shots and they tend to end up looking a bit the same from a stylistic point of view. I'd certainly be up for someone else "shining new light through old windows". You never know, it could be fun...