A variation on the Pent-Hex tessellation, using only pentagons. The one shown is a second-order fractal, but it could recurse to any depth if the folder has enough patience. Also, this models is flat, but the same pattern could be used to tile a curved surface. A spherical surface would result in a closed polygon with 72 pentagonal bases. The base would be a dodecahedron. This is on my list of things to fold.