Live plants are a good choice. They help providing a stable humidity level, they provide hiding and sleeping space, and you create more and more volume for them to travel on. Red eyes will almost never be on the floor, so the more climbing volume they have, the more they can move about.

A couple of good plants:
Photos - They grow like crazy, sometimes a few centimeters a day. They are almost impossible to kill, thrive in frog terrariums and provide excellent climbing space.

Bromeliads: Air plants, so they do not need to be planted in the soil, but can be placed in the background or anywhere.

Snake plants: Extremly sturdy plants that provide excellent sleeping plants.

Creeping fig: Grows alot and provide alot of climbing space.


They can take some time to adjust, it all depends on where the terrarium is placed, how it looks etc. If they appear stressed in the beginning, try covering 3 of 4 sides with something black, so they achive total blackness at night. Not using a night lamp might also make them feel at home more quickly.