In these examples, we used some discarded craft foam leftovers that created a negative shape heart, or students chose to rearrange into a new design. We also used discarded corrugated paper bulletin board border from decades ago, pulled from the trash bin last spring :).
This lesson took two class periods - in the first, we assembled the plates and selected our printing papers. In the second, we watched the demo and printed our papers. here is the way we set the tables up with "clean corners" for rubbing the prints and "messy middles" for rolling ink.