I have recently been experimenting with bird toys and came up with a great idea. If you get 2 shoeboxes and tape them together, (really any box will do but I prefer shoeboxes), then wrap it with old wrapping paper, and decorate it, ( will get back to different deco ideas), you have a long lasting playfort that your birds will love. But let me address some of the issues that may come up. First, litter in the base of the box. This is why I like to use shoeboxes, it has nearly everything you need. Take the cardboard that get put in between the shoes in the box and slide it into the bottom, it should be a perfect fit. Than get a sheet of construction paper, I like to color mine for added deco, and cut to fit on top of the cardboard. The paper can be replaced every few days and the card board every few weeks. If getting in the box is an issue then put some of your birds favorite treat in. It should help.
Now for deco, I like to lightly color the tissue paper from the shoe box, ball it and stick to the side of the box. They love to play with these and I make extra for when the balls fall off. I then line the seams in the box with old wrapping paper, usually striped. Next, I attach old yarn, but short lengths and in a way that if the birds get tangled in it it will come right of the wall of the box so as not to hurt them. I attach one inch by one inch envelopes home made from construction paper and fill it with treats for them to shred, one envelope every few days. I attach the envelopes with clothes pins to the string.
Hope this helps. My birds love their new fort!