The phrase "turquoise walls" refers to the color of the walls, which is a shade of blue-green.
Sentences with «turquoise walls»
Here, the pale turquoise walls are an icy contrast to the warm red quilt. (coastalliving.com)
I want to brighten up the room with a minty / turquoise wall color, and then make the wall opposite the art into a triangle mural using Walls By Mur decals. (playdatesandpearls.com)
Perhaps the dark turquoise walls here symbolize the sky and the sea at the same time. (howomen.com)