You wouldn't be the first to fall foul of Dr. Seuss's lawyers:
http://www.law.umkc.edu/faculty/proj...ons/Seuss.html
(note the section that states "The Cat is almost always depicted with his distinctive scrunched and somewhat shabby red and white stove-pipe hat. Seuss owns the common law trademark rights to the words "Dr. Seuss" and "Cat in the Hat," as well as the character illustration of the Cat's stove-pipe hat.")