Well my friend, it would be up to your own creativity. I could send you a picture, if you would like, of how I would do it. It would be better for you to go to Youtube and look up forest tutiorals. I know there are some good ones, not to mention here on this site! You should do some searching before you post something, but that's a just a tip!
In all honesty, though, you should play around with the many tiles you have and the use the layers creativly! You get the best Exp, that way!