My son is going through the superhero phase. So far we have made Superhero Capes, Superhero T-shirts and held a Superhero Party. He wanted a Captain America shield, so we improvised with recycling a lid and made one!
We reused a large plastic lid for the shield, together with a pipecleaner as handle:
He loves his shield, that sometimes with his Superman cape makes him the coolest superhero in our house!