Take every other corner tip and bring it to the exact center point. Do not crease these folds; keep them rounded so they catch the air.
Once the glue cures, you can sand and carve the paper stack just like a piece of wood. The different colored layers will create a "grain" look similar to a real wooden propeller. Method 3: Origami Helicopter (Gravity Spinner) Propellers.7z
For hobbyists making scale planes, you can "laminate" paper to act like wood. Take every other corner tip and bring it