I have lost the magazine where I saw this idea. I have done this with plastic spray bottles for diluting cleaning liquids, but it wasn't this pretty. I used a Sharpie to mark lines on an old peanut butter jar to guide kitchen helpers when making salad dressing. Imagine this with those art store glass paints - painting the whole jar except for a bottle silhouette window. I wonder what else I could use this for - limeade ratios? The French press? A glass teapot?