First, remember that everything is relative to the city where you will wed, to the season in which you will wed, to the length of your guest list, and so forth.
To give you an idea, we've collected the percentages for a 150-person guest list and a 10-member bridal party.
You're likely to spend...
55 % on reception table centerpieces and other misc. decor elements of the reception 14 % on the bridesmaid bouquets 12 % on ceremony decorations 7 % on your bouquet 5 % on the boutonnieres 5 % on the corsages 1 % on the flower girl's basket 1 % on your tossing bouquet.