There was a short thread on this that is now locked. Have seen a few references to this in more recent years but these seem to be focused on knitting animals and other fanciful objects (Leaf PDX, for example). Wondering if anyone has any leads to information (can't really say "pattern" ...) on free form or improvisational knitting?
Prudence Mapstone has a site and sells improvisational knitting and crochet tutorials on Ravelry that are beautifully illustrated, but I *think* they're mostly based on crochet. If you want I can look mine up and tell you for certain. I purchased three. I find her work so beautiful; I'd love to take a class with her, but she rarely teaches in the US: http://www.knotjustknitting.com/
Myra Wood has taught classes on this kind of knitting at Stitches the past few years. Her website doesn't look up to date, though: