Three of the comics that I picked up are based on or are adaptions of novels.
The Last Unicorn by Peter S. Beagle
It was made into an animated film in 1982. Mia Farrow was the Unicorn. Christopher Lee voiced the bad guy, King Haggard.
A brave unicorn and a magician fight an evil king who is obsessed with attempting to capture the world's unicorns. IMDB
And it's a gorgeous comic from IDW Publishing.
Issue 4, Cover B
A science-fiction publishing event! Who hunted androids before Rick Deckard? Taking place immediately after World War Terminus ends, the problems with artificial life - androids - become apparent. The government decides they must become targets, hunted down, but who will do the dirty work? Two men are assigned: Malcolm Reed, a 'special' human with the power to feel others' emotions, and Charlie Victor, who's the perfect man for the job - or is he? Meanwhile Samantha Wu, a Stanford biologist, fights to save the last of the world's animals. John W. Campbell Award-nominee Chris Roberson writes the prequel to John W. Campbell Memorial Award-winner Philip K. Dick's Do Androids Dream of Electric Sheep?, one of the greatest science fiction novels ever published. BOOM! Studios
The next chapter in the ROBERT JORDAN'S thrilling WHEEL OF TIME! Thanks to Moiraine, Rand Al'Thor has found out why his quiet life has erupted into chaos and what the myrddraal seeks -- and those answers will change his life forever. Plagued with visions of a great evil, and forced to leave the only home he's ever known, THE EYE OF THE WORLD continues here! DYNAMITE