Here in California, they actually grow locally, and are plentiful (and cheap) during in the fall - an obvious choice for centerpieces on the wedding dining tables (especially since it's easier to come by organic fruit than flowers). Combined with local, organic persimmons from my BFF's backyard tree, they'll make a knock out combo.
Though florists are familiar with their decorating potential, it's been rather more difficult to explain to others that my wedding colors (as it were... ) are being dictated by persimmons and pomegranates.
Since I have champagne tastes on a beer budget, I'll probably be doing something more like this:
Hooray for DIY tutorials!
and more POM DIY here