We did a little art project today. We have done this a few times this summer and it is one project that holds the kids interest for the longest time and they ask to do it again over and over. It is cheap, doesn't make a huge mess and I usually have everything we need to do it at any time.
All you need is food coloring, medicine droppers, coffee filters, a sheet pan and a towel. Lay a towel (not your favorite because the food coloring could stain) on the sheet pan. This will catch any spills and water that seeps through. Fill just a little water in some cups and add food coloring (I did about 10 drops). Then let the kids put drops of the colored water on the filters. That's it! Enjoy!