I guess I could go over to the local shop and order you guys some plate holders (if you'd be interested). If I remember well, the go for around 12 euro (9GBP). Don't know what it would cost to send them over however. Maybe even more than the holder itself.
The ones they sell here are completely black with only a small red or green streak that surrounds it. Got one on my civic, I'll try to post a picture in the morning.
K.
Update:
Here are the pictures. You "open" the holder by twisting the 2 plastic screws 1/4 and then it folds open.
Sadly, there's just not enough room for the small civinfo sticker at the bottom.