Surprise animals are ace [I'm currently drinking from my surprise bunny mug] which is probably why I rather like these mugs by Herdy.
They're simple but effective which is sometimes the best way to be. The colours are fab - I'm particularly keen on the orange one (not pictured) - and the sheep is just cute. I think I'd want the coasters too. The mugs cost £9.50 which makes it a nice baaaaa-gain*.
*I'm sorry. I couldn't resist at least one baa based pun.