Last month, I made Nigella Lawson's "Love Buns". Note that I used butterfly sprinkles with Halloween paper wrappers. I need to get a larger variety of cupcake papers.
The cake was a bit dense and tasted a little boring. But it would definitely make a good sturdy base for strong flavors; perhaps orange with a fudge frosting and candied orange peel for sprinkles.
The frosting took a lot of whipping; I was glad for my hand mixer. It came out with a consistency near that of marshmallows, but it was very good at holding on to those sprinkles.