They look nice in a window because of the color, some people like them in the bathroom as decoration, you'll find the early cork stopper variants in alot of different shades of blue. You can make a nice run of colors and sizes, but not normally of much value...[]
Oh man, oh man! My last name is Phillips and when I was a kid friends, family and neighbours were very kind to me by giving me old bottles to add to my collection. And all of these gifts were Phillips' Milk of Magnesias, since it was so fitting with my name. I had dozens of the things because I just couldn't, in good conscience, dispose of them. I will say they made a nice window display and the light cobalt ones were a nice balance to the dark ones.