Alice

One great set of illustrations for Alice in Wonderland [there are the old classic ones by Sir John Tenniel or the more modern Arthur Rackham] is oddly enough by Salvador Dalí, look at it here. His 1969 version of the art work is incredible; often odd pairings of artists and texts can be interesting, like the Italian Renaissance's Botticelli for his work here on Dante's The Divine Comedy.

Even if you don't normally like post-Victorian or post-Impressionist art, it's quite interesting and sometimes beautiful. It's definitely psychedelic.