Saw this cute idea of how to make a Shamrock while experimenting with color combinations at Free Preschool Crafts.
-Yellow & Blue Food Coloring
-Paint Brushes, Q-Tips or Eye Droppers
-Squirt or Spray Bottle of water
Cut filters into shamrock shape.
Dilute food coloring with a small amount of water. Have your toddler paint, dabble or drop on yellow and blue all over the filter.
Now give them the squirt/spray bottle and watch the magic of the colors combining to make green!
Let dry and display!
[We also made rainbows - an older child may have fun trying to create all of the colors of the rainbow using only the primary colors - I did.]
A great book to read in conjunction with this activity (and one of our household favorites) is "little blue and little yellow"
by Leo Lionni.
Some fun Shamrock games & Songs from Cullen's ABC's: