What image do you relate to each letter of the alphabet? Various artists were asked the very same question, so they illustrated each letter, and drew up a small scene relating to each letter, like this Beatle themed letter B by Michael Gillette.
Together, they make up the print series called "The Illustrated Alphabet, and you can see more examples from this great series at the link below.
http://www.creativereview.co.uk/cr-blog/2011/december/the-illustrated-alphabet