|"The Temple of Nug and Yeb by Drhoz|
H.P. Lovecraft was more than a great science fiction writer, he was a revolutionary at the inclusive mythos, wherein other writers used his menagerie of ancient multi-tentacled gods ever trying to leak out of their alternate dimension prisons and reduce the world to a smoldering ruin. Lovecraft's towns (Arkham, for example), his intrepid scholars and mysterious ancient books (like the Necronomicon, a ficcionne  despite what some circles say) appeared in the work of a whole flock of other authors, originally from within his pen pal circle of Weird Tales writers, such as Robert E. Howard and August Derleth. In a sense, this was Cthulhu was the first meme. In the age of the interwoven web, the Cthulu mythos meme has been leading newer and newer generations of artists into the chain.
Here are some Cthulhu-shoes:
David J. Roger has a vast blog of links to and art on the subject, in addition to his own work and ongoing interactive gaming.
Shaun Gentry is a genius "dimensional illustrator" with some extraordinarily detailed stuff, such as the above "Steampunk Clockwork Cthulu"
1.By ficcione I refer to the work of Luis Borges who often wrote about mysterious manuscripts, elaborate lotteries, bizarre literary experiments, creating a kind of fiction hall of post-structural metatextual mirrors effect, fiction about fictional fiction.