New leaves on this Indian bean tree emerge wine colored to chocolate, segueing to green in summer. White flowers are lavender-tinged. Though it can reach 40 to 50 feet tall and wide, it can be pruned hard to keep it shrubby. Zones 5-9. forestfarm.com
Sweden's Treehotel has a number of different tree houses to rent by the night and one of the coolest is the Mirror Cube, which disappears into its surroundings. A prefab version of it is now available for sale, complete with installation.