I've been using plastic zip ties and metal tie wire. The zip ties are not attractive and difficult to hide, and it's hard to use tie wire without leaving sharp ends pointing out. Also tie wire rusts. I know I can drill holes in the sticks and limbs and then jam on end down the hole, but that is very time consuming and once you are done, you can't change it. I'm about to re-do my veiled chameleon's cage and don't want to have to do it again for a while.