>source : http://bleedux.wordpress.com/2010/11/02/transparent-terminal-in-openbox-background/

using gnome-terminal, xcompmgr
sudo apt-get install gnome-terminal xcompmgr

and then add this on ~/.config/openbox/autostart.sh
xcompmgr -I1 -O1 -Ff &
(sleep 5s && gnome-terminal –geometry=40×15+0+540) &
this will make terminal show on bottom left… 1280×800 pixels…
use gnome-terminal –help for addition info

after that
copy – paste this to
~/.config/openbox/rc.xml