I anticipate this will come up a lot in this thread, so I'll ask it here, if that's okay.
Darren: Will it be considered good etiquette to ask someone "May I Phoshop this and repost it?" before doing so? I understand that photos are their creator's property, but I also understand that to post something here makes it open to constructive criticism, and lots of people are going to want to offer visual suggestions about what to do with a photo.
I was wondering if we could make this an "open-borrowing" thread? So that perhaps people can borrow a pic, 'shop it, and repost without needing to ask permission? I understand there are benefits and drawbacks to both asking and not asking, so I thought I'd offer it up to you to decide.
Another suggestion might be, if a poster is amenable to it, you could put in your sig line "All photos open to borrowing unless otherwise noted" or something similar. Or maybe we could invent a term for it

Borrow-shopping?
Again, just tossing out ideas to see what you and other posters might think.