Or several readers have commented that baby oil accomplishes the same thing. Glycerin can be found in the baking aisle of craft supply stores in small bottles. Probably at least 2-3 teaspoons per cup of water.
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Grandma...........I'm Borrrrrrred!! This looks like a great winter time boredom buster (and of course snowglobes are my favorite thing). http://www.ourbestbites.com/2011/12/how-to-make-a-homemade-snow-globe/