Finding ways to play outside in the winter can be tough... especially if you have a little ones that need to stay close. Which is why I am LOVIN' these; homemade ice blocks
Collect some of yogurt cups, the Yoplait cups aren't good cause they have a inward edge. The off brand open cups are the best... plus cheaper :) You can wash the cups in the dishwasher (on the top rack) without them melting. Now just fill them with colored water and let the cold nature do the rest.
We are doing other containers too, old butter tubs, sour cream tubs, and old milk cartons that are cut down work nicely too. You can even make rainbow bricks if you want too and have the time.