Brent Schoonover (Horrorwood, Astronaut Dad, Vincent Price Presents) has posted some art jam pieces that he contributed to, including this one for The Dark Crystal (Schoonover drew Aughra). Others in the link are tributes to The Infinity Gauntlet, Stan Winston, and Stephen King. The pieces were all commissioned by Matthew Reed, who shares these and some Star Wars-themed ones at his Comic Art Fans site where you can also see the names of the other artists involved.