Here are just a few of his titles:
The Da Vinci Cod: and other illustrations to unwritten books, 2006;
Ottoline and the Yellow Cat, 2007;
Goth Girl and the Ghost of a Mouse, 2013.
Riddell illustrated Neil Gaiman's The Graveyard Book,( 2008) which won a Carnegie Medal, in, 2010). This is just one of many awards given to or associated with, the work of Christopher Riddell.
Sometimes his talents produce a work hard to categorize except perhaps Swiftian satire, like this: