Cut a thin dowel or skewer to desired length (clip pointed end from skewer); paint and let dry.
Choose two coordinating sheets of origami or lightweight paper. Cut a square from each the size you'd like your pinwheel to be (ours range from 3 to 6 inches).
Use spray mount to glue squares together. Fold in half, diagonally, and in half again, then unfold.
Cut along each crease two-thirds of way to square's center, dividing each corner into two points. Bring every other point to center so points overlap.
Hold in place, poke a pushpin through center, and, keeping points in place, remove pushpin. Insert a map pin into hole formed (the pushpin hole is slightly larger than circumference of the map pin, enabling the pinwheel to spin).
Thread a small bead onto pin behind the wheel, and poke pin into dowel 1/2 inch from top. To prevent wood from splitting, soak the dowel tip in water before inserting map pin.