Love the idea of bending the lillies down and attaching the brooch. Could also wrap lace around the glass vase to get a more vintage look and cover up some of the green stems - I'd add large, black ostrich feathers.
Brudslöja are what the little white flowers are called and i just find them so pretty. Small little table center pieces wit these and then one bigger one for the main table. With lilac roses. And little flower sticks with table number :)