Living Walls look amazing and can really go a long way to making your home more inviting. Have plants indoors not only cleans your air, but also adds a whole new dimension to your room. When you have a vertical garden hanging from your wall, it's 3d wall art at it's best. livingwallart.com has a bunch of ideas about living walls including what to think about when installing including types of plants, watering, etc.
NASA has a list of plants that can be used indoors to help clean your air.

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