zeda Nightfire

I was wondering if any one knew where the picture we see when signing in are stored? There was a very pretty picture of my friends and I would like to find and use the picture for an in world invitation. I have no idea how to find it, or if I even can. Anyone know how to find these parting shots? It was the last thing my viewer saw as I signed off and sometimes shows up on my sign-in screen along with the blue sign-in- bar. Thanks for your help and input. "z"