Growing up, I loved doing scratch art in art class. If you are not familiar with scratch art, it is where you use several different colors of crayons and color a sheet of paper with the colors. After all white space is covered, you then use a black crayon or pastel to color over all of the colors. Once everything is colored, you "scratch" a design into the black. When you scratch off the black, the colors on the bottom appear as the design.
This art activity is done the same, but with the use of an ActivBoard. Everything is ready for the teacher or student to scratch their design, the only thing that the user has to do is turn on the "Magic Ink" feature.