There have been many comics adaptations of Lovecraft. These are some of them. (Some images NSFW.) [more inside]
The Ward (Part 1 - Part 2 - Part 3) is a silly little Lovecraftian sitcom from the folks who bring us the H.P. Lovecraft Literary Podcast. (previously: 1, 2, 3, 4) The guys Lackey and Fifer are also writing a graphic horror novel set in the Jazz Age, Deadbeats.
Breaking the Fourth Panel: Neonomicon and the Comic Book Frame (1, 2) Alan Moore’s recent Lovecraftian comic dissected. (MLYT, Possibly NSFW language and SAN loss)
An introduction to the works of Alberto Breccia, 'often referred to as "The master of black and white."' A brilliant comic artist little known in the english-speaking world, his works have mostly been published in italian, french and spanish. In the '70s he and writer Norberto Buscaglia adapted nine H.P. Lovecraft stories, available here in ebook form (in spanish, but the art speaks for itself).