Transparent title pixmaps

I was wondering is it possible to use transparent pixmaps in RootTransparent titlebar?

This gives the idea I’m after:

I’m not sure is that decor on the screenshot placed in the wallpaper, but is that kind of decor possible.
I tried it with a png, but the transparent parts showed black instead.

Hmm, I thought there was a lot of discussion about the realness of that shot, but that kind of window decorations are plain impossible in any exisint wm at this time. If that shot isn’t fake then he’s using the wallpaper to give the illusion of window decorations etc.