This was for my cousin's 21st birthday party.
I made cupcakes with pound cake mixture combined with vanilla and lemon zest, then filled the cases with plain white icing. I used large silver cachous from Spotlight for decoration. Then I piled them up onto a silver cakeboard and decorated with a white and silver feather butterfly (also Spotlight.) The marshmallows were partly structural and partly pretty. The cakes were glued lightly together and to the base board with a plain white icing: the marshmallows were also glued in place and served to hold some corners together. I really like the white-on-white thing and this could be really good in a similar vein for Christmas.