Dollar store!! Seriously, they usually have fake greenery that you can stick into the foam forms for plant/flower arrangements for only $1 a piece. Select what you like and cut off the excess "stem" (might have to use a hacksaw or heavy-duty wire cutters). Make sure to trim any exposed wires or loose parts. Then stick them in a mound of epoxy putty. Paint that with child-safe brown paint and you have instant plants for a couple bucks! You can even texturize the base by rolling it in some eco-earth while the paint is still wet. Here's an example of a beautiful cage. I will be doing this for my GTP in the spring....