An elegant transparent gentoo wallpaper. In fact not 1600x1200, but it is transparent (and I use it myself on my 1600x1200 screen), and looks great. Indeed realy neat. Try it with different colours and gradients. Fits nicely with any icon set. Tango in the screenshot.
I'm currently working on GDM to go with it. (Some of it can be seen in the thumbnail of one of the pictures on my dekstop)