I just managed to grab the background and put it on my desktop, so it's definitely possible. I did some code tweaks to my own layout, and back when I had more free time, I actually made one for someone on my flist. The thing about your header is that it's not one of those neat little rectangular images you can just stow at the top of a standard-ish S2 layout, it's quite big, and the layout's built around the header rather than the other way around. Is the person who made it for you still on LJ and able to tweak it/give advice?
The more I think about it the more I'm convinced I have all the images in a folder on my external hard drive at home. I remember that I had saved them in case something happened and I had to restore it. Unfortunately the person who made it for me was first consumed by WOW and then disappeared from my online life forever. I'm sad, she was my original beta for Sex Ed and I miss her, her name was Circe. =(
It's actually the whole image I managed to pull off the layout. I've heard you mention circe in fic posts from way back when. Inevitable a part of online fandom life as it is, it's sad when people disappear.
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