I have a Making Icons folder and I save everything in celeb-name folders or show-name with character-name subfolders. And in those it's just a mess of screencap downloads,.psds from working on icons, and finished icon sets. But the .psds are named things like WorkingOnIcons1 and VanMorAgain and Untitled-5. The bright side is I keep copies of my cropped icons before they're altered. The dim side is, I have like a dozen files to go through finding the layers I need to remake.