I want to do a twilight themed room. I would like twilight mural on the walls. Do have any ideas for the room or mural?

Maybe using a monochromatic color scheme in different shades of gray you can depict a forest like mural. Include one large apple tree (in different shades of gray) but make the apples red. This will give the gloom/overcast feel of the Forks forest with a pop of color and tribute to the first book. I don't want to assume anything, but I'm guessing you don't have a problem a darker color scheme since it would be hard to do a Twilight theme with bright colors.

Glad I could offer a good suggestion. Good luck with your room.