If you like the look of a wall mural but don't want to commit to paint, opt for a wall decal. There are plenty of removable options, like this Watercolor Chrysanthemum from the Martha Stewart Wall Art Decals.
I've Seen A Lot Of Cool DIY Projects, But These Completely Blew My Mind. #4 Is SO AWESOME.
"Beautiful and fun interior design! Nature-themed "treehouse" wall art is great for children and young-at-heart adults!" I love this! It's so cool, especially if the ladder leads somewhere, like an attic turned playroom or something..