Following the tetraedron and the hexaedron, the dodecaedron is made of twelve pentagons (the seeds of the starfishes), linked together by twenty triangles forming a surprising shape. This shape was done following a very nice tutorial by the regretted Jonathan Johansson (France), also known as Sjoo.
This 5 cm version is designed to keep a reasonable price. It is thin, flexible and yet resistant. Another thicker version is available here.