saw this posted on digg this morning..
Apparently they use a 3d printer and can have have it to your door in bout 10 days,
they only do white or transparent and mix of both but looks pretty cool...
I don't know a heck of a lot about 3d printing this could be expensive for all I know,
but the results looked pretty damn good.
basically you make you model
convert it to collada or X3D
upload it to there site ...then wait
costs between $50 - $150 roughly