A sheepy crochet mug cozy made using Highland Hickory Design's pattern, a massive ball of Hobbycraft's 'Women's Institute Marl Soft and Smooth Tweed Aran Yarn' and a random bundle of unknown black yarn.  

The silly sheep was made using a 4mm hook. For a more plumper, fluffy sheep, you would be better to use a chucky yarn and larger hook.