I'm sure some of you have done this millions of times, but for newbies like me I thought this would be fun 
Making colorful ice blocks or ice spheres with empty 1/2 gallon milk cartons or balloons and filling them with water and food dye or tempera paint
U can do a google search for more ideas, here is one below

Making colorful ice blocks or ice spheres with empty 1/2 gallon milk cartons or balloons and filling them with water and food dye or tempera paint
U can do a google search for more ideas, here is one below
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