Pendulum Painting. This would be a great science based lesson for EOY. This was always one of my favorite projects in middle school and I still have all my "drawings" now. Great way to tie a lesson in with this and very inexpensive. - Heart-2-Home
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Tin foil, yarn, cardboard, and sharpies. This makes a cool low relief sculpture. Start by teaching about line variations, and color schemes (monochromatic, analogous, etc.). Cool project for 6-7th grade.