References for various fundamental things - composition, balance of details etc. I don't have sources for most of these as its something that was lying on my hdd for a while, but you should be able to look it up through google images.
Just after we bought a house I discovered Pinterest. We had to wait six months before we got the keys so I had some time to pin interesting home ideas. Months of obsessive pinning passed before I finally worked out my own project.