Seed

This is a rather interesting find. It may not be your classic gaming experience but I've been playing this all morning, trying to develop the perfect flower for the screenshot. So don't under estimate its addictiveness.

Seed is cleverly based on a complex mathematical equation. When you change part the plant's DNA you are changing part of the equation, which in turn will produce a different end result. You can create some really nice flower arrangements. Or, if you're that way inclined, create hideous apparitions of nature, like I did by putting in really high numbers, wicked.