CHRISTINA MARRACCINI Inc. Below are two links. The first is to a site giving instructions on how to grow moss on rocks by making a smoothie to coat the rocks. I have heard of people using buttermilk, yogurt, and beer as food for the moss in this recipe.
I like it for outside the basement door but wonder if the little gravel would be hard to keep in place. Might like with some groundcover planted in between.
Consider, though, that not all plants labelled "moss" are actually mosses. The 2nd & 3rd links show plants called Scotch moss, and Irish moss that are not mosses.
Source(s):
http://www.ehow.com/how_11697_grow-moss-…
http://davesgarden.com/guides/pf/go/2909…
http://springhillnursery.com/product.asp…