I don't really have any good ones to share off the top of my head, which is why I thought I'd start a thread!
I've got an idea for a nice little swing.
I'm going to take a wire clothes hanger and use wire snips to cut where I've marked in red.
The black line goes through the areas I'm going to discard.

I'm going to reduce the size of the hanger hook bit at the top. I'll cover the end in electrical tape or similar so it's not sharp.
I'm using one of the plastic-coated wire hangers, so the area where the wires are twisted together at the top are not sharp.
As indicated by the arrows, I'm going to pull the wires in and bend make a "D" shape (with the flat part of the D being the bottom where they actually hold on to swing.)
I'm not sure what I'm going to use to make and cover the perch area. (The straight side of the D.)
I could wrap with some paper towels for padding, then cover with duct tape, then self-adhering bandage?
Not sure. I'll have to play with it a bit. I'll post some photos when I'm done!
I've also got my Kool Aid day nests. They're a super popular spot for hanging out during the day.
They're simple to make. You get a Kool Aid canister like this:

Remove the label.
Use a pair of scissors to poke two holes in the side, about an inch apart.
I'll use a section of clothes hanger wire and bend it into a double hook and hang on the side of the cage.
OR
I'll take some hemp twine, get two lengths. Tie a couple knots in the end of each one, so it's large enough to stay inside the nest, without pulling through the hole. Then use the twine to tie it up, usually in a corner.
You could also use them as hanging food bowls.
So whatcha got, folks? Any goodies to share?