Liz at Felt Cafe shows you how to make a felt french press cozy.
Liz writes:

It the traditional wet felting process (wool roving+hot water+soap+friction) and is best suited for someone who has made flat felt before, but is ready to try something a little bigger. Advanced beginner techniques included are: how to have cut edges and felt them, and how to work a little bit larger and what extra tools can be useful (like nylon netting, bubble wrap, or a bamboo blind).