I wrote a whole post about swapping your bookcases for wall-mounted shelving. Wall-mounted shelving takes up less space, and can almost appear to blend in with the wall. Image from Stadshem, via Freshhome.
Green Thumb: The Easiest Indoor Plants to Grow In Your Home - The cascading greenery of an English ivy is the perfect, subtle touch of nature for your home. And according to WebMD, it’s one of the most air-purifying indoor plants.