Sorry about that /forums/images/graemlins/confused.gif I copied it to the post, but it didn't work for some reason. I'll try again...
1. Put a handful of the moss you want to grow into a blender. Just go into the woods and grab a bunch of moss that you like the look of. I don't bother with the garden center stuff, like some suggest.
2. Add 1/2 tsp. sugar and one can of beer (the cheapest brand). You can substitute buttermilk for beer if you want, or try a combination.
3. Blend just long enough to mix the ingredients and break down the moss.
4. Spread the soupy mixture with a spatula or paintbrush over the ground or rocks where you want the moss to grow.
Tips/Hints:
Remove as much dirt from the moss as you can before you start.
Once you've spread the moss mixture, don't over wet it or you will wash the mixture away.
Every now and then spray some dilute beer gently over the area.
Works best in areas that don't receive a lot of direct sunlight, in other words, places where you'd normally find moss.
My best experience was when I used a skunked keg left over from a New Years Eve party. I just wheeled it around and sprayed the rocks... worked great. I'd post pics, but unfortunately it was at my old house. When I get the retaining wall done that I'm currently building, I'll be sure to post updates on the projects board.
Lichens, unfortunately, take a lot longer to grow. So long, in fact, that some are used to date stone walls.