I’ve been thinking about painting a patterned accent wall in the work-lounge (living room) of my apartment, so I’ve been looking through pictures of what I’ve done in other places.
One thought is to create pattern similar to the leaves on that Marimekko curtain, and paint it on the wall behind the Queen Anne. Not in white, but in a shade just a bit lighter than the wall color, or in varying degrees of lightness to mimic sunlight filtered through leaves. Subtle.
Another idea: cast shadows of the palm plant with a bright light, trace them with a chalk pencil, then paint them just a shade darker than the wall. I don’t know; I’m just thinking out loud. I may rather repaint my kitchen first.
Following are more images of fancy walls.
Below are some nice bits of inspirado from a Google image search of pattern painted walls. These images make me want to edit my living room, strip away some of the stuff! My apartment has gradually gathered more and more; this one of the dangers of being in the same space for six years. 
e daggar art: THE MUSEUM 