Does he prefer destoying wood? Untying knots? Nibbling on rope? Cotton or sisal? Or does he like shredding paper? Once you know you can cater your toys to your IRN.
Hane, my IRN, loves all of the above with a special emphasis on knots specifiacally knots in leather. Therefore I would make homemade toys with wood, cotton rope, and lots of leather strips with knots in them.
For shredding toys, Hane loves black and white newspaper rolled up and stuck in a toilet paper roll. I always cut the roll though so he can't get caught inside. Besides newspaper I've used white computer paper as well. But he liked how the newspaper tears better.
His veggies and fruits often become a toy, especially when hung on a kabob. I've begun hanging his kabob in different places in his cage, sometimes making him hang upside-down to get to it. Just makes things a little more interesting for him.
But he loves all his store-bought toys too, especially the ones with big chunks of wood he can destroy.
Hane doesn't like swings, but my sister's IRN, Tsume, loves his swing. Every bird is an individual.
Kalle is a beautiful boy! You take good care of him.
You just gave me hope, lol. Hane does what Kalle did in that last picture. Maybe Hane is a boy after all. We'll just never know until he grows (or doesn't grow) his ring. ^_^
Oh, and for wood use untreated pine or other untreated softwoods. For rope make sure it hasn't been treated with anything either. The leather strips can be found from a birdtoy place, they normally have stuff you can buy for making your own toys.