Because of the way Buddhism developed in Eastern cultures as Chan/Zen and because of the way Chan/Zen was adapted in the 20th century by various artistic movements (especially the Beat Generation), the 'artistic' aspects of Buddhism have tended to be expressed through the language of Chan/Zen. There are many Zen-inspired books and films--you can easily find them on Google.
But what I find interesting about the notion of 'Buddhism in Art' is that any piece of art (film, song, book, etc) need not explicitly deal with Buddhism for it to be Dhammic. The notion of 'art' necessarily involves the process of interpretation. By interpreting any piece of art through Dhammic lenses, we can identify Buddhism in it regardless of whether it deals with 'Buddhism' or not.
David Loy, for instance, has interpreted Lord of the Rings
, Miyazaki's anime, Philip Pullman's His Dark Materials
trilogy, and Ursula Le Guin's Earthsea stories through Dhammic lenses in . I really enjoyed the book. Although it takes a Zen perspective, there are various ideas about non-violence and selflessness in the book which are shared by all Buddhist traditions. Well worth a read!
For something more specifically Theravadin, the work of the Thai contemporary artist Montien Boonma is explicitly Buddhist--he was particularly inspired by the teachings of Bhikkhu Buddhadasa and Ajahn Chah. I've posted a thread about him before... hang on...... here it is: viewtopic.php?f=21&t=2271