There are loads of sites about decoupage on line but you really have to trawl to get free prints to use. I use to use wrapping paper, old magazines, old greeting cards etc as well as some of the sheets availible. Now there are lots of shops that supply complete kits and different sheets. You could use images from google images and from clipart.I know that when I use to produce items for sales years ago it was the ones decorated from magazines that sold the best because they were true one offs and needed more artistic imput! have fun.