If you're looking to increase your backyard entertaining space on a budget consider making this concrete patio bench. You'll put together the sides with concrete blocks and the top is a wooden plank covered with scrap foam padding and outdoor fabric.
How to make a Sub-Irrigated Planter. I'm not sure I would use a two liter plastic bottle though. Over time I would fear the plastic breaking down enough to poison the plant. Perhaps a wine bottle instead.
The Bottle Growing System is a hydroponics system; the plants water from the reservoir below. Up to twelve Fast Plants in a Bottle Growing System is ideal. This system works well for both group and individual projects with FastPlants®.