Not from lucid dreams, but I've gotten ideas for several of my books from regular dreams. It's one of the reasons that I started looking into dream incubation and control (which led me to LDing). I figured it would be really helpful to be able to dream specifically about something I was working on and just let me imagination go crazy.

I've always had "epic" sort of dreams for some reason. I've always said I have action-adventure type dreams -- they are more often than not like movie plots.