If your interior decorating ideal is somewhere between Dr. Who and the engine room of the Enterprise, this may be the iPod accessory for you. The iBlueTube, from Japanese vendor Thanko (we've covered their stuff before as did Engadget Japan; apparently there's now an English site as well), features 2 Philips "6922" vacuum tubes and 12W outputs -- and a slightly breathtaking $449 sticker price. On the plus side, it is available from a US domestic site.
Make sure to tell houseguests that the blue glow is due to Cerenkov radiation. Yeah, spent nuclear fuel, that's the ticket!