I think the purple or yellow tulips would look really cute, as well as the yellow calla lillies. The purple hydrangeas don't really look right, not sure if it's because of the blue-ish tint of the flowers or because the shape of the flowers is similar to the flowers on the dress, but something just isn't working.
Which is your favorite?
p.s. Sorry I cut your head out of this picture Michelle...I wasn't sure if you wanted your picture all over my blog!