Is this possible on Ubuntu desktop 12.04? Specifically, I would like to run xscreensaver as the Unity desktop wallpaper.
Open your terminal and paste these following commands
sudo apt-get install gconf-tools gconftool-2 -type bool -set /apps/nautilus/preferences/show_desktop false /usr/lib/xscreensaver/glmatrix -root
Then restart to apply the changes.
credit goes to Life hacker