A dungeon I used for a PBP Delve

[Coyotemax]

The actual game maps have various lighting effects on them as well that adjusted as the encounter progressed. These maps just become the base layers for the in combat photoshop file.

So you send out copies showing only the parts that are in visual range then?
Not familiar with the play by post for this sort of thing. A friend tried to get me involved in a play by mail thing years back for some galactic domination game, with thousands of trade routes, diplomacy, world exploiting etc, but I couldn't get into it.

That's actually a pretty interesting idea. It occurs to me one could adapt that for an overhead display, using masks to reveal what's in range, like a fog of war