Eiffel Star
This clever modular takes a patterned paper, repeated 12 times, and makes it look like a kaleidoscope. The module is not difficult to fold and the construction is not too hard either --- assuming you are willing to pay close attention to the orientation of the paper and fold reasonably carefully! It's a good chance to try this modular model even if you have never tried one before. Bonus: If made from 7.5 cm (3 inch) paper, the star will fit perfectly into a Fuse hexagon box (see my other class) made from 15 cm (6 inch) paper, making a beautiful false bottom.