Depends on what you want, but here's some ideas: https://www.hometalk.com/search/posts?filter=faux%20paint%20walls
What sort of look are you going for?
Look on you tube and watch some of the 100s of videos on faux painting of walls unroll you see you you like. Have fun.
Maybe use a coloured wallpaper to give colour......or flood the wall with a coloured light bulbs.......... OR Do you want to do a faux finish using paint, If so, what faux finish are you wanting to do.?
First UPI need to determine what faux look you want to achieve. YouTube is a great place to look fo tutorials