Spin-Off magazine has been doing a series of articles where a spinner collaborates with a knitwear designer. These articles provide good insight into the design process.
Here is a photo of a pretty Estonian lace shawl, spun with the fur from Nancy Bush's Sheltie dog Kloo, from the Fall 2001 issue.
And here is a Scandinavian-inspired project from Deborah Newton in the summer 2002 issue. The yarn is a wool/silk blend.