Shasta Daisy
Aster/Michaelmas Daisy
Mountain Bluet
Veronica Speedwell or other varieties
Coral Bells and Bishops Weed (most grow them for foliage but the flowers look good in a mixed bouquet)
Ladies Mantle
Lavender
Rose
The following self seed so they act like perennials:
Sweet William/Dianthus
Snapdragon
Love-in-a-Mist
Sweet Peas