So many great ideas! I agree that walnut shells should not be used if you have any mice in your sewing place. My husband used it on his model railroad and it attracted the little critters who made a real mess. Apparently they retain a smell even when they are treated. And do keep magnets away from computerized machines. I love the Harbor Freight bowls but they really have a strong pull to them. Someone I know put one of those magnetized things with little metal bits to play with on her puter monitor at work and it fried it.