Get the XWinWrap deb package from this site and install.

http://3v1n0.tuxfamily.org/dists/edgy/beryl-svn/

# gnome-terminal
# xwinwrap -ni -argb -fs -s -st -sp -a -nf -o .3 — /usr/lib/xscreensaver/flurry -root -window-id WID

.3 means screensaver’s transparency. It can be set 0 to 1.

citation;
http://tombuntu.com/index.php/2007/09/14/animated-wallpaper-with-compiz-fusion-on-ubuntu/
http://blog.livedoor.jp/vine_user/archives/50741154.html