This coral-inspired model (with 3-fold rotational symmetry) was generated with a single mathematical expression using the implicit surfaces filter in MeshLab. Please check out all of the other implicit surfaces at vertigo polka.
This is a European 6-in-1 Chainmail Necklace, where each center ring links with 3 pairs of side rings. The length of the necklace is approximately 33 inches and is composed of 300 separate rings. The larger rings are .65 inches in diameter and the smaller rings are .5 inches in diameter, with all rings being 1.55mm thick.
Here is a silver bauble made from two nested icosahedrons, connected to each other at the center of each of their twenty triangular faces. Check out my other pendant models in my Jewelry/Pendant section.
This silver bauble started out as two octahedrons of different sizes. The faces have been separated and rotated so that the vertices of each of the smaller triangles touch a vertex of one of the larger triangles.