SrtaA I simply spent 10 hours straight today researching and writing a massive material data sheet for all the current items in my novel. A process which was only supposed to take 2 or 3 at the most...
And now, I have a lot of source material which can be used as inspiration for more later on.
melonbread Also, something you can do which I used to and should really do some more.
Get a notebook and jot down ideas. A scene, a character type, a plot event, heck, even just a thought.
One idea per line, and before you know it, you have lots of material you can look back on. I personally preferred magazines with lots of pictures to serve as inspiration.