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Hi, I like the Roll20 layout very much, and I have been playing around with the unconventional possibilities the medium offers. Here are some of the ideas I have used / have planned:
Make a map in the style of a blue print (design notes and specifications, blue background white lines for walls, including power lines). Have the players find the blueprint so they start out with a complete overview of the installation (accurate or not, only time will tell). Any inaccuracies will then be updated when they arrive at them (for instance landing the fleeing players in a blind alley, due to a bricked up door).
This is a sci-fi campaign, having the players fly into the debris from a battle. As they approach wreckage's or asteroids, gas clouds, radioactive clouds or other surprises are revealed as they move within ranges.
Having the players step into an elevator, and changing the map by moving them to new levels.
Having doors that close automatically, reinstating fog of war in rooms they are not currently in (allowing enemies / NPCs to sneak around) inducing paranoia in the players (most effective was an investigation of a small space ship with a dubious "ally" they didn't trust, so whenever he broke off from the group, the suspicion set in).
Have rooms slowly fill with a damaging / lethal agent (like magma, poisonous gas, decompression), and having the players forced to rush through the complex, filling it in on the map as it advances, to create a sense of urgency.
Do any of you have any other ideas or experiences with creating unorthodox maps? I would like to steal shamelessly from creative ideas, to keep my players on their toes.