We just started using our overhead projector to project images for backdrops. (Don't know why I never thought of this!

) There are so many images out there! If you google and search by "images" instead of "web" you can find pictures for any backdrop. We also you The Christian Click Art that Sunday Software sells, which has some very good art and photos.
The images can be printed using a color inkjet printer on the appropriate transparency films.
Obviously, the stage lighting is limited when you're using a projector, but it is so much easier to print a transparency than to paint a backdrop. And you can change your scenic backdrop several times within a play.
Peace,
Lisa