I just wanted to quickly show off the first attempts at theming the landmass. So I started with a familiar look. Grasslands, forests, and mountains. I've left the oceans alone for the moment, and focused on the land. Keep in mind that this is the first iteration of many to come, but I have a good feeling after coding a few hours. I present, "Forest island".
I will come back in a later blog post with technical details and the how-to's, once I've refined the techniques and experimented further.