I've got some new ideas and techniques in store for this build. I plan on using a green (both in color and in eco-friendliness) stain on the bottom, possibly black rails, and au naturel on top. I've toyed with the idea of finely grinding up some plantlife (grass, leaves, etc) and disolving the particles into the epoxy when I glass the bottom. Other options would be to mix a small amount of tinted woodstain into the epoxy. I still want to see the wood grain through the tint so I'll need to experiment with a bunch of options.
Here's the look I'm aiming for on the bottom:

