Carol - Hannah loves this bouquet. It has the amnesia roses, quicksand, and I guess white or off white. Since her dress is white, I would probably go with white. But she would also love dusty miller around the perimeter if it doesn't get too wimpy.
Lovely idea for each ceremony chair - but a bit more English would be - when the Bride & Groom walk your way, throw some petals and shout hooray! Great idea rather than a grand entrance because you usually walk back to get more pictures taken