When my children were toddlers and preschoolers, I grabbed an egg carton and painted each hole a different color. After it was dry, we went on a nature hunt for colors, and my children tried to find something in nature that matched the color of each hole. A small pine cone was brown, moss was light green, grass was dark green, and a small rock was gray. Pink flower petals were lying on the ground, and we picked them up. My children had a great time, and it helped them to pay closer attention to nature.