From the command line:
sudo apt-get install ccsm
(or from synaptic)
And run ccsm.
click on the 'animations' icon
Set everything to random
Activate snow (see the keyboard shortcut on the snow button)
Activate the cube and the gears. Make the cube transparent.
Activate expose and a lot of random stuff.
Spend the rest of the night trying each other effect.
Have a lot of fun.