These are the things that make up the artwork in the "Canvas" section, including both the individual scraps that are pinned or glued together, and the original canvases that are torn up to make the scraps (aka "Prescraps").
I've also linked to my photobucket account where you can see the full array of canvases created to represent any given color (I typically paint 20-30 separate canvases to represent any single color).