Today I made my first "rock" trough out of a styrofoam fish box. Here are the items you will need to create your own:
Styrofoam fish box (Mine was from a pet store, but you can also get them from fish market)
Wire Brush (bought mine at Big Lots $2 for 2)
Heat Gun (found in the paint department of most hardware stores)
ShopVac for vacuuming up styrofoam pieces
Tip: Do not attempt to rough up styrofoam inside of the house as this process is extremely messy.
I am planning on planting mini gardens in my new troughs.