Cyc Effects

For those theatre shows that are lucky enough to have a cyc and for people like myself who would like to see what other designers do when it comes to lighting a cyc and getting various effects to work. I think it would be great to get people's advice and comments on this, I know I'd like to learn more and get some ideas for future shows - How to do a sunset or sunrise effect? Some interesting looks people have come up with? Recommended Lee/GAM/Rosco filters to use to create various effects? Other ways to use a cyc? An open discussion!