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Paint with Ice. Add food coloring and clothes pins before making ice in trays. Once frozen, kids can use them as the 'melt' on paper...
Sensory bottles! They used Voss water bottles. Not sure where to find them but any water bottle will work. use mineral oil for a way to slow down the materials in the bottle. I usually do 2/3 water to 1/3 oil. Can also do just rice and small objects for I-Spy bottles.
As summer heats up- try a really cool art project! This takes some planning- you have to let the ice freeze overnight... But how much fun would it be to creat ice sculptures in the backyard on a nice summer day! All you need are some containers of different sizes and shapes, food coloring, water, and some imagination!