Here is Xfce 4.3 UNSTABLE using xdesktopwaves. It fits especially good with my wallpaper, so I will let him use my CPU until I will change the wallpaper again. xdesktopwaves doesn't use that much CPU as it is shown on the screenshot because I was letting him burn my CPU by moving windows a lot to get a good shot. :> After having a look at htop it uses 8%! (sic)

http://xdesktopwaves.sourceforge.net/