Stellations of the Dodecahedron Java applet that shows various stellations rotating and morphing into each other. Very cool.
Small Stellated Dodecahedron MathWorld article
  Great Stellated Dodecahedron MathWorld article
Small Stellated Dodecahedron Wikipedia article
Stellated IcosahedraThere are 59 stellations of the icosahedron. These pages contain various images of these stellations and some background information.
Stellations of the Icosahedron Informative article in Symmetry, Crystals and Polyhedra by Steven Dutch
First stellation of icosahedronWikipedia article
Icosahedron Stellations MathWorld article