My gaming group is currently running "The Shadow Harvest," a Cathulhu scenario set in ancient Egypt around the 24th century B.C.E. The scenario's been a lot of fun and very rich in atmosphere as well as historical detail, which got me thinking...
Why not have a full Call of Cthulhu supplement set in the ancient world, pre-Roman era? This would include Egypt, Sumeria, Babylon, and other settings from the beginning of recorded history but with likely a focus on ancient Egypt, the most famous of the potential settings. The supplement could be something like the Reign of Terror mini-campaign in length, with Sinister Seeds for Babylonians, Phoenicians, and so on.
What do you think? I believe this would be a popular campaign setting, worthy of a full book. The angle for cults would be fantastic.