Scribble Bots are loads of fun to make and provide lots of creative thinking opportunities. This simple version uses a small motor and pens fixed around a cup. The motor makes the arm Popsicle stick spin, which in turn makes the scribble bot move.
Give kids the challenge, such as getting the Scribble-Bot to draw a dotted line or left to explore freely going through an iterative process of designing, testing and amending their ideas. Try different propellers such as a cork, clay or straws and mix with different objects like smaller cups and cans or even a small box. Tons of fun.