- silicone muffin cups (or a candy/brownie mold -- aluminum would also work)
- food coloring
- fishing line (Dental floss will also do the trick!)
- clear tape
- cake pan or cookie sheet (optional, but very helpful)
- Cut several lengths of fishing line (or dental floss), one for each mold. Make each one into a loop and then secure it inside the bottom of your silicone (or aluminum) mold using clear tape. Tip: We used 12 heart-shaped muffin cups, so I placed them in a cake pan for easy transport. If you are using a candy mold, you might wish to place it on top of a cookie sheet for the same reason.
- Add colored water to each mold. We had snow paint at hand, so we didn't need to do any mixing. I just poured some from each bottle into small paper cups so that the kids could easily fill the molds. If you don't already have colored water, just place some water in each mold and then add a drop or two of food coloring to each one. Tip: I don't recommend filling them more than 2/3 of the way if you are using muffin cups. Full cups were a bit bulky and took considerably longer to freeze than the ones that were only 1/2 - 2/3 full.
- Place your molds outside to freeze. (Alternatively, you can put these in your freezer, but with cold winter temps, it just made more sense to use the outdoors.) The shallower ones were set up in about 3 1/2 hours, while the fuller cups were done in about 6 hours.
- Remove the colored ice from the molds. With silicone, it is simple to just peel the mold away from the ice. For aluminum, it may be easier to run some warm water on the bottom of your pan to help release them. Remove and discard any left over tape.
- Hang your colorful ice shapes outside and admire them!