Thanks, guys. The moss is actually growing in the "sphagnum chamber," the idea for which I got from mass. The original moss to get it started was also from mass.
Here's a few more color examples:
Here's something else I tried. This was (obviously) lit up, but I put the piece of felt in the background and used an LED flashlight to shine light on it, which created the spot. Also focus stacked. Couldn't use even a remotely high f-stop because it dragged the texture of the felt into the picture. So it was 4 shots, each at like f/3 or something.
---------- Post added at 01:22 AM ---------- Previous post was at 12:58 AM ----------
Felt like uploading this one, too... also focus stacked. >.>