Grow an Avocado Tree from the pit (for a houseplant, it probably won't produce fruit). After drying, the pit is suspended in a glass of water and once there is root growth of about 2″, it can be planted in a pot of soil and tended to as a houseplant. If your climate allows, you can plant this outdoors.
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Growing your own fruit is just a hot as growing vegetables and herbs. Bring an apple orchard into your backyard without losing your entire yard by planting a columnar apple tree. Varieties in the Urban Columnar Apple series grow only 8-10 feet tall and less than 2 feet wide, making it easy to grow and harvest the same as if you had an acreage of apples. Plus, their height and texture make these trees a perfect focal point in the landscape.