Here you can find some things I have crafted from various materials.
Klein bag (With crocheting instructions)
Origami bull head (With instructions)
Origami hydralisk (With instructions)
Inverse Sierpinski tetrahedron (From cardboard, with net for folding)
A little being made of Fimo. It has two relatives on this website: a drawing and an IFS fractal.
A compound of five tetrahedra made of paper rolls. This model was to serve me as a guideline for making a wood version of the same shape, but I never finished that one.