We made the sweetest little mouse cake for Libby's christening last year and were delighted to make this, her first birthday cake.
The cake is an 8" vanilla sponge with a vanilla buttercream filling and the unicorn is handmade and edible ... but you'd have such a sugar hangover the next day I'd caution against it.
p.s. all those sprinkles were hand cut by yours truly. Thousands, hundreds and thousands (geddit?) of them.