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Are you doing pre-heresy or post-heresy Thousand Sons?
If it's post-heresy, then I'm thinking about something along the lines of the 'Hallelujah Mountains' from the film, Avatar but with lava and warpfire instead of plants.
Spoiler:
I'd imagine a Tzeentch influenced location to constantly be changing and re-forming, mountains floating around, the earth constantly cracking, spewing forth lava and fire, buildings constantly changing appearance and layout.
Also, check OneMindSyndicate's video about Daemon worlds for some inspiration, he mentions some Tzeentch worlds in the video.