Lone Crow Collage filled an envelope with a combination of papers, including a bunch she had made herself. I have enough to make a LOT of collages (no pressure now!).
In addition to what you're seeing here (and you're seeing just the tip o' the 'berg), are various tools, materials, suggestions, and a big tutorial packet about making collages -- a seminar in itself.
Aprons one day, collage materials the next, another postcard from Sarah M. from France . . . it doesn't get much better. And now if you'll excuse me, there's obviously some work to be done!