Glue glass plates together with an epoxy resin. Choose plates that are made from clear colored glass, and then stack them, from largest to smallest, with a glass bead or other embellishment in the center. These can be adhered to garden stakes or simply set in among the ground cover. A fluted glass ramekin makes a nice layer of inner petals.
When you trim your birch or weeping willow tree, the soft and flexible branches can be wound around into a wreath shape. Start with the thicker ends, and wind them until you get to the tip. You can tuck the ends into the wreath, using their own pressure to keep them secure, or you can tie them off with a piece of twine.
One popular craft activity is making painted birdhouses. Some people like to use vibrant color schemes, but others prefer to keep the colors natural and subdued. Unfinished birdhouses are available at home-improvement warehouses and at craft stores. Paint them with acrylic paint, and then seal them with lacquer or varnish.
Decorative yard signs and plant stakes are other popular garden art craft items. You can purchase precut wooden signs and plaques, or you can use an old cabinet door or a piece of weathered barn wood. Sanding, priming or sealing the wood is not necessary--the look is rustic, so aging and weathering work aesthetically. Paint with acrylic paint, using a stencil. If you have a talent for hand-lettering, then you are in luck. Such phrases as "Love grows here" and "Please feed the humans" work well for yard signs.