Two Intersecting Tetrahedra
(Stellated Octangula)
This figure is really a stellated octahedron. By using two colors to create the figure you can make your polyhedron look like two tetrahedra that pass through each other.
The template is below for making two intersecting tetrahedron. Each pattern makes one pyramidal point of one tetrahedron. You will need to cut out 8 of these shapes ... four pyramids of each of two colors ... and, as always, create tabs surrounding all outside edges.
Fold each shape along the fold lines and glue the two bottom edges to each other. You will now have a small bottomless pyramid.
To see the full sized template click on this image: