One that I can think of off the top of my head is the Jersey Wooly. This is a small wooled breed. They are known as the Fluff of the Fancies. An American breed, you'll find their club page gives a good history into this small 3 lb rabbit.
Searching for this breed online I found them used as laboratory animals. Beyond that... not a lot else. :) I would assume that since they vary in size you could selectively breed for what you wanted, just working with the qualities that you desired.