A Rhombic Mandala Based on Pi Over Nine

ninths The interior angles in these rhombi all measure π/9 radians, or some whole-number multiple of that amount, up to 8π/9 radians.

A Polyhedron with Only Pentagons and Rhombi As Faces

I made this with Stella 4d, a program you can find at http://www.software3d.com/Stella.php.

Blue Rhombi

This was created with Stella 4d (site to try it: http://www.software3d.com/stella.php).

Also, here is a multi-colored version, made with the same software:

A Rotating Array of Rhombi