Again, this won't pull you out of a major depression, but I found this article interesting. I've always been drawn to trees, and I missed all of the deciduous trees I grew up around when I moved to Phoenix, Arizona for a time. I have been thinking about what kind of house I might get in the future, and a back porch with a view of trees is very important to me. Other people have their own things about nature they're drawn to, I guess. Like oceans, or snowy weather.
In 1984, a researcher named Roger Ulrich noticed a curious pattern among patients who were recovering from gallbladder surgery at a suburban hospital in Pennsylvania. Those who had been given rooms overlooking a small stand of deciduous trees were being discharged almost a day sooner, on average, than those in otherwise identical rooms whose windows faced a wall.