The cube and transparent terminal window (Oh and the jelly windows!) are a part of Beryl, a graphic enhancement for the gnome desktop environment.
Ubuntu has a preinstalled, watered down version. Just go to System>Administration on the top menu in gnome (it could be System>Preferences... I don't have Ubuntu in front of me...) Enable "desktop effects", that's what you're looking for. You'll need to restart because you have the enable "commercial restricted 3rd party" drivers (for your graphics card).
As for the matrix theme, I think you'll be able to download that off the internet. It might be in gnome splash manager. (Goto the terminal and "sudo apt-get install gnome-splashimage-manager" or something if you don't have that...)
PS: Getting the desktops on a cube is tricky, just search for help online or post here if it gets the best of you... (like it did for me )
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"The Aperture Enrichment Center would like to remind you that the Weighted Companion Cube will never threaten to stab you and, in fact, cannot speak."
-Portal A.I.
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