I saw this idea on Pinterest. I put my leftover coffee from the morning in an ice cube tray and froze it. The next day I put the ice cubes in a glass and poured milk over it. I have butter rum flavored coffee and this was excellent! My mom also pointed out that it would be really tasty to do with Bailey's Irish Cream! I can't wait to try that too! I suggest waiting a little bit before drinking for the ice to melt some for more of the coffee flavor. Also be aware that the ice cubes are sticky and messy and a little hard to get out of the ice cube tray, but nothing too bad and very easy to clean up.