Another piece that Danny directed me to is this image of a tree covered in lace.
Attention to detail here is amazing - Andrew Harris uploaded this image to Flickr (although I am unsure if he actually produced the art or just photographed it?).
It is a great representation of human intervention with nature. It looks stunning to the eye and really highlights the trees form and turns it into a thing of beauty.
A useful site to learn more on this subject (Yarn Bobbing) is: http://yourstudio.wordpress.com/2010/07/23/crafty-folk-futures/