Sure, much of soft jazz can be wallpaper. It goes in one ear and out the other--you get very little out of it beyond a sense of chill and boredom, but every so often there are groups that put out decent stuff or try to.

Fattburger, a San Diego group does a pretty good job at doing decent stuff. This is one of my faves:

http://www.youtube.com/wa...RI5yfObQGk