Cool craft, may be comfortable, fairly cheap.
But, have you seen a PVC pipes furniture? You will be amazed of what kind of furniture you can make out
30 Creative Diy String Art Ideas use rainbow colored strings against black. have the students write five things they want to draw before class. (use as basis of the shape for string art)
A Mini Easel From Clothespins Do-It-Yourself Ideas Wood & Organic