- use food coloring and water - mix and put in an ice cube tray - as the colors melt, they mix
- use water colors - they mix with paint on white construction paper
- use those fizzy tablets
A teacher at my school made a cute song to help the students remember color mixing and I made it into a file. You will need to print it on a Legal sheet of paper to get it all on one page.
Here are some great color idea websites:
How do you teach colors and color mixing?