There's a reason Sofia Coppola keyed the palette of her film Marie Antoinette around a box of French macarons: the feminine pastel tones are simply chic and utterly delightful.
So, why not think inside the box and forgo a traditional bouquet for your flower girls in favor of an arrangement of macarons? Your little flower girls will be engaged by the sweet pastries, and your guests intrigued. Though the meringue-like domes are light, the sum of them may be heavy, so make sure to reinforce the bouquet sleeve — perhaps by starching a piece of lace or other fabric. You may even want to superglue the pastries to keep them looking nice; it's all about the illusion. Just save extras for your macaron girls to eat themselves!