Check out this website for the absolute most cool book cover t-shirts you will ever find. They have loads of them.
I don't wear shirts with words on them on general principle, but for these I may be persuaded to change my stance.
It's also for a great cause:
"In addition to spreading the joy of reading through our tees, we acknowledge that many parts of the world don't have access to books at all. We are working to change that. For each shirt we sell, one book is donated to a community in need through our partner Books For Africa."
Check it out.