Try one of these adventures with pigments and light
Figure out the color that's opposite on the color wheel.
Practice your test automation skills with drop-down lists (combo boxes).
Mix pigments together.
Practice automating checkboxes.
Understand the RGB color model by combining colored lights.
Practice with list views.
See how a color is represented in many numeric formats.
Practice with radio buttons.
This example has little to do with colors; it's just been hacked into this demo site.