Nothing speaks more royal than shades of purple. Below are some royal "pale purple" flowers. You can call them lavender, some are even lilac but together or separate, they all are just splendid.
Top row: Dahlia, Shirley Tulip, Lilac Rose, Dendrobium, Allium
Middle row: Sweet Peas, Purple hydrangea, Mini calla, Carnation, Purple Anemone
Last row: Eustoma, Matthiola Stock Lavender, Hyacinth, Mum, Cattleya Orchid