Just stumbled across a great web site: www.gardenmolds.com. They offer concrete tips/technical advice, recipes, colored pigments and concrete paints, stepping stone and totem molds, a photo gallery that tells how they achieved the different finishes, and an internet resource guide for supplies. Some items in their photo gallery include perlite and peat moss. Haven't been able to cruise the entire site yet, but wanted to share with all of you.