wood

So i've had this little bit that came with my cage for sometime now, and it's a small natural perch maker, where one takes a branch from outside and uses it in the bird's cage. I picked one from a tree out back, set it up, and Hermes loves it, though... maybe a little too much? He nibbles at...

I want to use one of these for the back side of the new cages, instead of having them wired; but I want to make sure that the fids won't get poisoned licking it. I was thinking of a melamine sheet but it's too expensive, shame because it 's very easy to clean. Breeding cages have 5 wooden walls...

So I've been reading that some toy and other object can be very dangerous for a cockatiel too. Like toilet paper, some woods, some plastics, different types of metals, etc. I was wondering if anyone had any safe ideas for some homemade toys I could safely make and some specific things to avoid...