My former roommate drove a VW Touareg and I noticed that she had a "euro" license plate replica on the front. She had it made with the same letters/numbers as her California plate to stick on the front bumper. I recently bought one for my 986 with the same letters/numbers as my CA plate through
this website. $44 includes the custom plate and a universal mount (less without the mount), and you can make it read whatever you want.
Sample:
Of course this isn't legal, and you may not think it looks good, but I thought it was a cool way to give Stuttgart a little shout-out way over here in LA (especially since the Porsche logo includes the Stuttgart crest, which is in a decal on the replica plate). I'll post some pics once it arrives and I screw it on.