My daughter went to a Waldorf school for a few years when she was young. Every house around here that has) had a kid in the school had Waldorf stars in the windows. They are basically modular origami. Made with this lovely translucent glassine paper (we call it kite paper) it’s strong and creases beautifully. The overlapping folds make really pretty patterns when the light shines through. Today instead of stars, I made hearts.
They are really easy to make. You could make them with tissue or crepe paper, they would also be pretty with origami paper for card marking.
Simple tute follows
Start with a square and crease from corner to corner.
Fold in two opposite corners of the square to touch the centre line. Then bring the sides in to the centre line
Finally fold the top corner down a little. Make a second one of these. Join them together with a slight overlap. Use a glue stick. When joining, overlap just to the top off the side fold
