Tzeentch has always been my favorite of the Chaos gods. It might have been how the Lord of Change reminded me of a Skeksi.
Since then, Tzeentch has gone through many incarnations- with the rise and fall of M'Kachen, and the introduction of Fateweaver and Ahriman. Horrors went from funny little chibis to wild messes of tentacles and back again, flamers went from headless fungoids, to bird skull monsters and later to a jumble of gibbering firey mouths.
Here is the current Tzeentch chariot for a Chaos Demon force:
Now, I had previously painted up quite a few blue and pink horrors for this force, so he had me paint his Brimstone Horrors.
They're pretty fun little guys, and very numerous (here's just a sample of the many brimestone horrors that are part of this force).