Custom Barware, Light Up Ice Cube - Reusable & Cold Activated, These reusable ice cubes are freezer safe and function as real ice cubes, keeping your beverage cold. The blue light activates only when dropped into liquid. Imprint your company name or logo on the side (s) of these light up ice cubes to promote bar mitzvahs, frat parties, weddings and more. ... #LIC34 $1.81/each.