This lesson Plan from EDSITEment looks very good.
Allegory in Painting:
When discussing allegory with your literature classes,
you may also wish to cover the use of allegory in art.
This lesson plan examines just that, following a set
of four activities and looking at the works of Cole,
Boucher, da Fiesole, Watteau, and Caravaggio.
(copied from Riverdeep Newsletter)