Hey! So I have been trying to deal with some of the same things you have, in terms of making everything seem sophisticated and not like a kid party, with my fairy tale theme. Anyway...
I love love love the pinwheels for escort cards! They are so cute, and so much fun.
As for the centerpieces... I'm not super crazy about the first one, because it kind of looks like two different centerpieces combined in a way... I mean the bottom part looks so much more formal, and then there are the "fun" things sticking out of it. I really do like the second one, with the table name done in a fancy frame, but if you did that I think maybe you should look into some sort of base, or figure out a way to incorporate the flowers in the background into it to make it a real centerpiece?
Here are some other ideas I found. Obviously they would have to be done in your colors though...
This one is cute, but it might be a little too "little kid." But, I think if you used only dum dums to your colors it might have a better effect... though that could be hard to get...
This one I really like because it uses flowers, so it still gives that wedding feel, but the vase or jar is filled with candy (jelly beans, it looks like) to give it a more carnival feel. Again, obviously this would be done using your colors:
You may hate both of these suggestions but I figured I'd throw them out there to try and help. Good luck making your decision!