The image above has faces colored by number of sides, while the one below is in “rainbow color mode.” I made these using Stella 4d, which you may try for free at http://www.software3d.com/Stella.php.
Two Views of a Wrinkled Octahedron
RobertLovesPi.net
Polyhedra, tessellations, and more.
RobertLovesPi.net 
these are Wonderful!
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Thank you!
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