Could be for any occasions too!
I know it's way too early for Christmas, but since that's all I have in mind, might as well just get it done ^^
Draw your picture on one side of the eraser.
Gently carve the lines and color blocks out from the eraser. Remember, the part you carved out will be the 'light/blank' part, and those left flat will be the dark/shadow part.
Get the paper card and ink pad ready. Mass production begins!