I've long daydreamed about designing an artificial ecosystem. Something where I could have plants that reproduce and grow on their own. Since I'm not much of a one for simple models, I haven't ever actually started this project. However, a woman named Laukosargas Svarog has created her own fully functioning ecosystem in Second Life.
Plants that grow and reproduce. Bees that transfer pollen between plants. Sun and rain to provide necessary resources, etc. Simple, but amazing none the less.

