historiated

Google Doodles include a number of historiated instances of the Google logo: http://www.google.com/logos/index.html

historiated

adjective.
Describing the initial letter in a manuscript that is decorated with designs representing the text.

"Historiated or not historiated?" mused Herschelle Gibbs, as he wrote the first letter of the first word of the first paragraph of the first page of his autobiography.