A rummage through the garden shed can produce many possibilities for garden art. An old, leaky watering can and a washtub can be turned into a country-style fountain. Weld the watering can to the tub at an angle so the spout is pointing into the tub. Add a small pump and a hose snaked up through the hole in the watering can, and you have a fountain to put among the daisies.
Old bowling balls gathering dust can be turned into art in the garden as well. Group a few together in a garden bed for some out-of-season color. Vintage bowling balls are colorful and look great lined up as a border. They also are weather-resistant and can be left outside.
An old bed frame can be set out into the yard and be turned into a garden bed. Fill the center with flowers and other plants, making sure to have some spill over the sides as the covers on the bed.