8 Point Star
A shuriken like modular star by Robert Neale. It’s also called octagon star or “Pinwheel-Ring-Pinwheel”. It’s easy to make and once all the modules are assembled they slide in place.
It can be either a ring or a pointy throwing star (that’s why the “Pinwheel-Ring-Pinwheel” name), but it doesn’t change shape on the fly.
Paper to use
Made with 8 square papers, I used 10cm square papers, but for its function it might be better to use smaller squares.