I have Indian, Pink Winged, and Annam Stick Insects.
I use a tupperware tub with X's cut into the top to stick blackberry brambles into. You can also use sticks with leaves from rose bushes and raspberry bushes.
I mist them with warm water 2 to 3 times a day and they are SOOO cool! They multiply so rapidly which makes it a bit easier to feed them to my chams...I know there will be more.
Oak leaves, Privet and Ivy can be used but I stay away from those. My fear is that oak has tannic acids, ivy is not editable for humans and same with privet so I don't want that in my chams. Again those are my thoughts...I haven't found proof that those plants, ingested by feeders, will hurt chameleons.