Now, when I think monsters and storybook type images I think Sendak (Where the Wild Things are). While these do have that storybook feel, they're something completely their own. The artist's name is Don Kenn, who sometimes seems to be referred to as John Kenn. You can bet that his work can be creepy (and is probably what attracted me to it) and has a sombre feel. Take a look at some of these pics. They're great!
As per his blog HERE, John’s a writer and director for television shows for kids. He draws these bite sized wonders on pieces of Post-it notes (interesting medium use). Definitely take a look at his blog for more. Also, it looks like he’s got a book out called “Post-it Monsters”. The edition linked to his site is no longer in print but it looks like a deal will have it in a new edition in the future. I’m in.