Get your hands on Crystal Productions catalog and Art Video World
catalog. You will find many posters and videos from which to choose. I
really like the Sister Wendy series for history of painting... but
some don't care for her.
Here is another good resource from National Gallery of Art:
Exploring Themes in American Art - Abstraction, the figure, historical
subjects, landscapes, still life, portraits, narrative art and so much
You can carry those themes across cultures and time periods too.