The children really enjoyed playing with the rock dominoes I made last week. It took a while to make them because I made so many but I love adding materials that children can use both outdoors and indoors.
I purchased river rocks and put a piece of masking tape around the middle of each rock. The next step was to paint the ends of the rocks. I painted the rocks with different color ends as well as with the same color ends which created a variety of ways children could match the colors. After the paint was dry I carefully removed the masking tape. You can see video of this activity here.