The hubs makes wood block hanging toys for our fids. He cuts different sized and shaped blocks, drills a hole in the middle, then puts a rope through them, tying knots on either side of each piece for footholds. Our U2 loves it more than the pricey ones we picked up from Drs Foster & Smith. I also take old catalogs and make improv forage toys by twisting the paper around a treat like a tootsie roll or a pouch and use some twine to tie the ends. They don’t last long, but a basket of different colors with different snacks (avi cakes and dehydrated fruit pieces for the win!) is a welcome diversion. Lulu likes throwing hers around before digging in. These work good with the 2 IRNs as well. Pages wadded up into balls seem to amuse my ‘too as well. Junk mail is free! Who needs a machine to shred it when you have parrots?
I love the cardboard toy idea. Have plenty of boxes around here, for sure.