Some additional info - the mounted paper prints were done on by Adoramapix in NYC on a gloss Kodak 'metallic' paper. Photos of them don't do them justice; they really do seem to have a glow to them. <edit to add - I bought the frames and mats separately and did the paper print mounting myself - I think you can also get them pre-framed, but then they'll be big bucks.>
The metal ones can be had in various finishes ranging from matte white to gloss silver; the Dynaco one is gloss silver, IIRC, and the OTL tubes are printed on a matte white, as are the resistors. The metal ones have come from either Adorampix, BJ's Photo or a company called Aluminyze. These likely won't be much good to you folks down under, but I'm sure there are similar photo printing companies there, too. (Search for something along the lines of 'aluminum photo prints', or 'metal prints', things like that.) The aluminum ones seem expensive until you stop to consider that you don't need to buy a frame and mat, and go to the trouble of mounting them. They're still $$, but that makes the cost a bit easier to justify. That and I wait until they have specials on them; sign up for the coupons and they will occasionally have 35-45% off sales, and some do a first order discount.
-Pat