The Getty Museum has one of the finest collections of Greek and Roman art around, with lots of pictures on its website. A little hard to find, just go to the Museum Tab, click Explore Art, and browse by subject. And they happen to be doing an exhibit on The Image of the Heroic Warrior.

The Rage of Hercules by Odds Bodkins
"The stories are vibrantly retold:The lion of Nemea, the slaying of Hydra, the poison arrows, the stables of King Augeas, Hippolyta's girdle. In his reworking of Hercules, Odds Bodkin shares all of the labors and adds his own modern flair." Thank you, Amazon. You can get this either at the library, or download it from his site.

And here is a travel article that gives a rough overview of Heracles home turf: Mycenae, Olympia and Delphi. There are some tantalizing hints that could spark many different directions for a team to go in.