Yeah, I do that a lot too, Shawk. I usually do that kinda thing with an aspect of my pictures, like the flames in my sig... but for things that I want to play around with a lot, it's not really much of a hassle to create a folder for it and save all the components into it. That way, if I crop part of my sig and then later decide I want the full picture that I had already cropped, I can just go into the folder and get the original, and put it back in. But then things can get messy, if you're using too many layers.... guess that's where Adobe Bridge can come in handy
I know my sig here is pretty crappy, I didn't really put any effor into it. If we can get larger sigs, I'll probably make something like my Hellgate forums sig,
this guy.