Sometimes we will buy the "husk toys" (that's why my girls call them) that have a variety of shredding materials all inside one tearable cup or woven basket. We shove nuts and dried fruits down inside these, and for the quakers we add everyone's moulted feathers or bits of poly rope and leather strips so that there are lots of surprises. It's fun to stuff them before hanging in the cage. It's even more fun to watch the quakers later weaving their treasures into the bars of their cage!