Is your bouquet supposed to match the rest if the flowers?

I don't think it has to. . . mine mostly did b/c I liked certain colors and types of flowers, but there were certain elements that didn't really "match"-- like our arch. It only had purple hydrangeas, but we didn't use purple hydrangeas anywhere else. I think it is nice to avoid clashing or using two really different types of flowers (like, it may be weird to have really soft, wildflowers for your arrangements, and then have a really sleek calla lilly bouquet), but otherwise you don't need to use the exact same stuff.

I don't think it has to match exactly, but they should all compliment each other.

It doesn't need to match, but it should compliment. My bouquet is going to be all cream with little greenery, whereas the rest of the floral decor will be much more colorful.

No rules - follow your heart

They should at least coordinate or have similar flowers/colors in them.

Mine will, but only because I am am using roses for both.

Mine won't match everything. We just have the bouquets, corsage/bouts, center pieces and two 3 ft tall vases on pillars for the ceremony. My bouquet, corsage/bouts and center pieces have orchids and Cala lilies, the two tall vases for the ceremony my florist will use different flowers, can't remember what it's called but it's a hell of a lot cheaper.

Mine will only match in colors. The BP flowers will match, but the reception centerpieces will be a variety of different flowers that are shades of white, peach, and coral (same colors as BP flowers).