The one above is based upon the novella At the Mountains of Madness by H.P. Lovecraft. If you haven't read it, go get it. Really an excellent work and the inspiration for sooooo many movies, TV shows, novels, cultural references, etc. that its ridiculous.
Other cool H.P. Lovecraft art worked up recently by the students at the RI School of Design can be found here: http://io9.com/5684048/its-body-was-eyes-mouths-and-tentacles/gallery/