I should have incorporated more sorcerous rituals in my game. My players didn't feel Carcosa was very different from a regular D&D game.
If Hyadian Schism is still up you could raid a few more rituals from there. Might need a few conversions but there are few different ones I worked on back in the day. Google sites changed their format and I gave up updating it back in 2019.
I haven't played Carcosa in a while, but I did get a few ideas from Hyadian Schism and Songs That the Hyades Shall Sing. And those illustrations by Herve Scott Flament are spot on for a Carcosa game.
I have been wondering how the inhabitants of Carcosa would dress. Given their colorful skin tones, I have speculated whether they use drab colors for their clothes. They may dress in furs or leather, but if the technology is on par with that of the 6th century AD, I assume the inhabitants know about textiles. Of course, they can just as easily have the same fashion as the folks in Barsoom!
Grognard Day: If an old-school D&D player sees his shadow, it means his group will spend six more weeks playing 5E.
The primary lightsaber colors are red, green, and blue. The primary pigment saber colors are cyan, magenta, and yellow.