One of my favorite Tv appearances is repeating this weekend on Central Texas Gardener. I explain hypertufa with Trisha Shirey. Hypertufa is a material that you can use to create faux rock planters, step stones and all kinds of other stuff, even table tops. Hypertufa is very lightweight so it's good for making very large pots that you can move more easliy than one you might buy. Check it out!
http://www.klru.org/ctg/resource/hypertufa-design-with-colleen-dieter/