Would be amazing to be able to make students something from class like a virus, cell, bacteria or even DNA! I think it would be excellent to make organelles or cell pieces that actually look like they're supposed to and students could have something tangible to touch and see.
If students really liked a certain topic in biology it would be nice to be able to give them something they could keep. Whether this be an animal, a cell shape, a virus or anything else we cover this year so that they could keep it hopefully motivating interest in them for the rest of their educational career.