What do you think for cake toppers?

If we do just a simple white cake with black ribbon at the bottom of each tier, and some of your blue flowers, I think it would be very elegant to do the cake topper as two love birds.

or blue birds.

 

Or Blue Love Birds.

these can be painted your shade of blue

Then we have some built in themes for centerpieces/ favors:

Like this from Martha Stewart. But these could be done as part of your centerpieces, rather than having one at each place setting. 

Even if you don't do the nests, I like the birds : ) --mk