Nature.

I discovered this back in 2007 playing around with images I'd taken out my kitchen window ~ http://www.flickr.com/photos/bootload/sets/72157603995704881... I also keep a hand colour set on flickr for reference ~ http://www.flickr.com/photos/bootload/sets/72157600195794663...

Back in 2007: "If I ever need to do things like come up with ideas observation of nature and complex systems such as the web is always a good place to start. Here I'm looking at colour & colour schemes. Never would have thought of this combo and ratios" ~ http://www.flickr.com/photos/bootload/541666109/