I've just finished painting a new backdrop for my forthcoming Conan and Lord of the Rings projects on the reverse of my more rural 18c countryside backdrop.
A distant mountain range with a lilac sky (many good fantasy skies appear to be this colour)
Frazetta's Conan in battle with Frost Giants
Safe and Sound on the Sundial by Rodney Matthews (I have this poster on the attic door)
I also did a couple of desert backdrops too, as I hope to start painting some Stygians soon.
Here's how the backdrops stay up. They are made of 3mm MDF
the other more rural side
they come apart for easy storage (or at least are meant too, but the feet get a bit stuck sometimes).
I need to make some fantasy terrain now in a Swords and Sorcery style.