I think legally you are only allowed to drink liquid awesome out of such a cup.
If that is not available I vote for tequila! Mostly because once you get fucked up enough you can play ET for that ancient device and not care anymore.
It's a pity that there aren't appropriate liquors in the blue and white color ranges. Curacao and Godiva White just seems a little sissy for a Commodor shot glass.
I'd come up with something tasty that has four or five layers and call it a copperbar. :)