These are "moist chocolate cupcakes, topped with chocolate buttercream and crushed oreos. Up-coming Spring and the love of bunnies inspired these quirky birthday cupcakes for a special someone" and are by Aunt Tiffy's Cupcakes (via Flickr). They're a custom cupcake company in Dunfermline (UK).
And some closeups:
I love that this bunny above is totally buried under dirt/frosting! Adorable.
Aunt Tiffy's Cupcakes
contact at aunttiffyscupcakes.com