I'm kind of a sucker for calla lilies for weddings. This photo, from Colin Weddings, is one of my favorite examples of callas for weddings because I love the sleek silhouette and the color variation from that dark green to the citron hues and then to white. Love that!
This bridal bouquet is mixed with gorgeous phalaenopsis orchids in white. If you're looking for something striking, simple and oh so elegant, then try going this direction. Experiment with something like this by going to your local hobby or craft store to play with the artificial florals. You can grab some callas and orchids (and any other flower for that matter) and create your own look. Once you find something you like, snap a photo and text it to your floral designer.
For help in identifying some popular white wedding florals, take a look at this card for some ideas.