Plant some flowers.
If you have some extra space in your garden, you can create a real, live Mother's Day canvas. First, buy various packets of flower seeds that grow fast and well in your region. Then have your kids draw a picture or write a short message (like "We love Mom") in the garden dirt with a stick. Drop the flower seeds into the dirt lines; then cover them up, and water every few days. Before long, your picture (or message) will be blooming, and you'll have a Mother's Day gift that keeps on growing.