The really obvious one is to get an eiffel tower like this http://www.amazon.com/M14-Decor-Replica-... . You can add a few beautiful flowers to this to jazz it up. Try lavender or irises which are indigenous to France.
You can also try some potted herbs like lavender or rosemary in small terra cotta pots tied with some nice ribbon. Very south of France.
So I'm planning my best friend sweet 16 it Paris themed I want it to really classy I need a idea for a center peice REAL ANSWERS ONLY PLEASE