Hi

If you google "wall murals" you'll find some that are wallpaper.

Also check out Anderson Party and Prom online. They have some 'woods,' beaches, and mountain backdrops.  Years ago I saw one HUNG from a pvc pipe like a backdrop.

Another option is "do-it-yourself" enlisting the help of artists in your congregation, or even pages from a coloring book projected onto the fabric that you have attached to a wall. You would need an overhead projector.

The advantage of recruiting artists in your church to do the drawing is that you can then have volunteers involved in doing the painting. If your artist types provide "color by number" direction, minimal art ability will be needed for the painting part.

You can make it a party, and perhaps get youth involved?

I hope that helps!
Blessings
Jan S

Some personalized wall murals are offered by Eazywallz.It has DIY application and it is also reusable ,repositionable.it gives traditional look and feel. www.Eazywallz.com

You can also paint theater flats with generic Bible scenes/landscapes.

Google "theater flats" for how to make them. They are easy and versatile.

Flats are covered with canvas painter's cloth.

You can also paint on canvas and hang it.