Here's where I got my inspiration for Mimsy! If anyone else makes one I'd love to see what you come up with. She has a Flickr group where you can submit your own "Molly Monkey". There are some really cute ones there to check out.
Here's mine. You can read about the pattern tweaks I used at my Mimsy Q & A blog post (if it's not up yet, it's awaiting approval so check back later).