Replace a pantry door with a screen door! For an even bigger impact, paint it a cheerful hue (try Byte Blue by Sherwin-Williams). The small surface area requires only a sample-size pot of paint to get the job done.
Why didn't I think of that?!?! Easy wainscotting idea: buy frames from Michael's, glue to wall and paint over entire lower half. Got this tip from a savvy home improvement person. Ha! That's stupid easy.