This is not a picture of five delicious cupcakes, waiting for someone to lick the icing off the top of them. They're actually Bath Bakes by Ms Patisserie, and they're made of a fizzing bath-ballistic style base, with the icing making up a reusable solid exfoliant.
They cost £6.50 each, which is certainly an indulgence, but for the odd bath when you're looking for a bit of a treat, totally reasonable. I'm going to try to track one down to see how well it performs. Find out more at the Ms Patisserie website.