Sashing Stash Accent Trim Posted on September 3, 2016. Updated September 3, 2016 by duganek. Curtains before (left) and after (right) Sashing Stash. Jennifer Goheen brightened up her mother’s classic white curtains with Flying Geese Sashing Stash banding. “It gives them a Greek look,” she says. See her article about how she did it.