My fourth grade students were super excited to work with wire (Twisteez brand works best) to create their own wire figures after viewing and discussing images of Alexander Calder's Circus.
The lesson plan is available here: Calder Inspired Wire Figures
As an easy follow up, especially if some students finish early, I like to use a drawing lesson inspired by Calder's graphic work. It uses the same primary color palette that pervades his mobiles. The drawing lesson is available here: Calder Abstract Faces