like the backgrounds for hermit crabs? i've used it before in a 10g pygmy tank before. they look quite nice, but i really wouldn't say they do much for humidity. only live plants IMHO help keep in ambient humidity
Or you can get like a 1000 coconuts and skin them and make your own sheets
??????????
Wouldn't they be a breeding ground for bacteria?
What about the natural cork tiles by ZooMed as an option? Anyone try it? Bacteria issues?