some good ideas in there, the only problem being i can't cast glass and have no experience working with it at all.
Even excluding the fancy glass enclosure I'ld bet having some kind of way to display a physical bitcoin as if it were a trophy would be interesting to some.
casting custom qr-codes
Ha, that's it!
For a bar or restaurant, create a drink coaster which has the bar's bitcoin address QR code. Or, even better, each coaster has a unique address. When you want another beer, scan the coaster and pay. The bartender knows before your table server!
Or pay your dinner tab to it. It's the bitcoin equivalent of Square's dongle thingy!
The private key could be used on Mt. Gox and the funds swept from that address into the exchange account as each payment arrives.
