Think Wil e. Coyote. tall natural stone pillars are good. blocks LOS can be flat on top for jump troops and they are easily moved around without slowing troops down. put a couple sand dunes on either side and a line of these down the center and instant ravine.
A mate of mine works in a surfboard workshop. He gives me the foam spill (they're roughly conical mounds about two foot high). With a bit of trimming and shoving, I made a canyon wall (Impassable terrain) for a previous club.
I've also got other friends who play wargods, and they have an egyptian themed desert canyon table.
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