I haven't input all my puzzles onto the site, and need to figure out if I can add extra pictures that show the replaced pieces? I'm still figuring out how to use all the features on here. I make the pieces out of thin cardboard (like from a cereal box) several layers glued together, then white paper on top if needed, colored with markers or colored pencil. The hardest part is cutting the tiny shapes out! but I think I'm getting better at it (my kids usually can't find the replacement piece in the finished puzzle.