Miles Teves is the guy behind creating the looks of creatures and characters in some great sci-fi and fantasy films! He did concept art on Legend, Robocop, Total Recall, Interview with a Vampire, Blade, The Mummy, Idle Hands, Explorers, The Witches of Eastwick, Batman & Robin, Hollow Man, Spider-Man, Terminator 3: Rise of the Machines, Reign of Fire, Van Helsing, Pirates of the Caribbean: The Curse of the Black Pearl, and Chronicles of Riddick, King Kong, and more. I love this guy’s work!
Good description (with samples) of drawing on toned paper.
Figure drawing on toned paper by ~Darkdesyre on deviantART.
Maybe it would be a good idea to checkout Orlando auctions. I have never been to a city based auction before. I could find good deals, but what prompted me to search for them was the idea that I could sell my art there.