Changing Cups Challenge is inspired from an idea on Pinterest.
You need some foam coffee cups and sharpe pens. Take 3 cups and stack them together. Then write the alphabet around the edge of one of the cups, spacing the letters out evenly. Write the alphabet on the other two cups so that they line up evenly with the first cup. The letters should line up and you can spell different chords with by rotating the cups.
Other possibilities are making intervals. Can you name the interval displayed?
Another idea is to build inversions.