Little Women by fashion designer Orla Kiely,
Oliver Twist by artist Sir Peter Blake (see more of his cover work here),
Treasure Island by architect and sculptor Frank Gehry,
and my favourites, Around the World in Eighty Days by architect David Adjaye,
James and the Giant Peach by sculptor Antony Gormley,
and The Secret Garden by author and illustrator Lauren Child (a really nice use of layers here, though presumably this will make the book fairly fragile). Says she: "I thought it would be interesting to do a cover where one could peel back the paper layers, one by one until the garden and the girl are revealed - it was just a nice way to conjure the secretness of the garden."