euro license plate?

[Festively Jolly]

im thinking a european plate would be pretty spiffy.  i know this is
stupid to ask. but it *IS* illegal riiight?  i mean they wouldn't stamp
numbers or letters on this plate i would give them would they?  

also, would this even fit on the US spec 1988 Audi 90? LoL  ok i just
wanted to get the facts :)  thanks for reading this hokem.

oh i think I've seen a pic of a US spec audi with a euro plate before.
couldn't tell you who  or where it was though. 
 any thought are MUCH appreciated!