Daisies are the less formal version, and could be used for flower girl halos. Don’t discount baby’s breath. A bouquet of that alone is both beautiful and inexpensive. The gladiolus is a good choice to add height, some as tall as 48”.
The ranunculus would be very striking, maybe with a black or green center.
Maybe the bride would enjoy all white, and have her bridesmaids have a mixture.
The planning is so much fun!