This recipe may not work when it's humid outside... the humidity level can alter the way the candy sets up and when it is humid it will be sticky. It may still work, but you have to be careful when handling it when it is sticky. You can also get similar results using a hard blue candy like jolly ranchers and break them up with a hammer until they are tiny peices. Then cook it on a cookie sheet for around 7 minutes at 350 if you don't want to make the ice candy from scratch.
Author Rachel recipe from AllRecipes
3 3/4cupswhite sugarmust be white granulated sugar
1 1/2cupslight corn syrup
1tablespoonlemonor other flavored
extract-make sure that you use a non colored extract or it will tint the finished product
blue food coloringI used about 10 drops of McCormick food coloring
In a medium saucepan, stir together the white sugar, corn syrup, and water. Cook, stirring, over medium heat until sugar dissolves, then bring to a boil. Without stirring, heat to 300 to 310 degrees F (149 to 154 degrees C), or until a small amount of syrup dropped into cold water forms hard, brittle threads.
Remove from heat and stir in flavored extract and food coloring, if desired. Pour onto a greased or silpat lined baking sheet/ jellyroll pan (the kind with raised edges). Let cool, and break into large pieces that resemble broken ice. Store in an airtight container.