That's a nice cage for him. I remember making bird toys from twigs and branches when I was a child, but it's been so many years, so I can't really give you any tips on doing it. We also did something like putting empty rolls of toilet paper on a string and things like that, which they seemed to like.
I like the idea of putting some large natural branches into the cage instead of those three even perches that usually come with a cage. I could use a nice forest bath anyway. Maybe we get few dry days to go out before the winter comes. If not, I have something to look forward to in spring :)