I can't take my eyes off these flowers, and yes, I am partial as a wedding florist when I say that. Part of it is that from mid-August to early October is prime time to design your wedding flowers using seasonal fall flowers.  The hydrangeas, the dahlias, eucalyptus, lisianthus, and more are at peak beauty, loving the cooler temperatures, and coming into amazing color and maturity.  I have a hydrangea bush called Strawberry Sundae that I used in the girls bouquets, but also in the mother's posies.  They start out a soft ivory, then touches and blends of blush and pink slowly sneak in to give the most beautiful changing palette you can imagine. They wrap up the season with a bit of antique patina vibe.  Love them!  Flowers do have different tones to them, whether they are fresh from the garden, or direct from a farm overseas. White roses (depending on the variety) can come in with a subtle, blush undertone, and white spray roses can come in with a hint of green in them.  Work with your florist to understand more color nuances - we're working with mother nature, and sometimes we have to let her do her thing!