So... I had to show off this amazing bouquet brought to you by PETAL... what do you think?
From Sweet William, which was picked because of her groom's name, to Myrtle, which was used in royal wedding bouquets for centuries before Kate, each flower was selected with much thought. The final selection consisted of Lily of the Valley (which is impossible to find and $$$$), Sweet William, Hyacinth, Ivy, and Myrtle. 

http://thefullbouquetblog.com/
Next, would be Freesia. It smells wonderful and would be used to make the bouquet look organic and modern.
I couldn't put together such a feminine bouquet without using Sweet Pea. It also smells great and it's dainty.
The last flower I would use in my royal wedding inspired bouquet would be a White Dendrobium Orchid. It brings a unique touch to the bouquet without over-powering any of the other flowers. 