Matt pointed this out tonight at Record Exchange in Lakewood. Kind of a clever way to display buttons or anything small and flat really. I'd suggest coins, stickers, leaves you collect on fall walks (not much time left for that), funky photographs or magazine clippings. With a CD stand that's a bit less obtrusive you could take the display idea and turn it into interactive artwork: maybe use some colored sand (you'd have to seal up the cracks) or paint and mirrors on the bottom. Probably that's taking it a bit far, but still, a cool idea from Record Exchange.