These are some pretty nifty icons. Nice and clean while still being able to get recognized by the user for what they mean. The only thing I would've changed as opposed to them being just oulines, maybe have some solid colors inside the images just to help fill it out a bit more and make it look a little less iOS7-ish.
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I love this! Here we have one idea: a tree. But you have a few basic shapes that make up so many combinations. However, they all read the same way: a tree. A few small elements can become many different compositions. So many possibilities.