Making the letter Pp was really quite fun. Since we had so much popcorn from the Popcorn Sensory tub using popcorn was kind of a given. But I really wanted to make jello finger paint to add to the whole hands-on eatable experience, so I made only 2 colors, red and green.
1 package of gelatin (small box)
4 oz of boiling water
Mix the boiling water into the gelatin and stir. When you first add water remember the gelatin will set up. SO if you want the finger paint a little more sticky like Jello than 4oz should be good, if you would rather it be a little less sticky and more spreadable than you would probably like more water.