Send sleepover guests home with pillowcase favors that the kids can make themselves.
What you need
Pre-washed white pillowcases
Felt-tipped fabric pens or fabric Paints
Place the cardboard into each pillow case. This will act as a protective sleeve so that the paint does not go through each side and will also give the kids something to paint against.
The kids can decorate them freely or supply them with some stencils or templates.
Let them dry overnight by either hanging them on a clothes line or on a table.