As pointed out in the comments for "A," there are gobs of artistic options for the letter B. But there was one particular artist I discovered early. My English teacher for my senior year in high school stocked her bulletin boards with prints and articles, and among those was a print of a painting that fascinated me and perhaps led me down the road to art history as a profession. So...
is for Hieronymus Bosch.
( gardens of unearthly delights )

( gardens of unearthly delights )