I finally got my Nikon F-mount Pinhole Lens up on Thingiverse. You can see it at: http://www.thingiverse.com/thing:20993. Here is a link to a Flickr set with some photos of the lens and some images I took with it. http://www.flickr.com/photos/k0v0/sets/72157629762934733/
This is the pinhole attachment.
This was my favorite image.