Painted Recycled Can Herb Garden by Outdoor Areas and other super cute DIY garden ideas - Garden Tips and Tricks
DIY Water Wall with recycled bottles
Make a Recycled Water Wall for outdoor summer play and water sensory and science with recycled containers, toys, a pegboard and zip ties.
DIY Kids Water Wall by playingbythebook via curbly. this is more about play, but I think something a little more durable with this same idea might go well in the sideyard garden/play area.
toilet paper roll heart stamps - perfect for homemade valentine's day cards from your toddler! Just bend the toilet paper roll into a heart shape, tape to secure, dip in paint, and decorate!
Fun with water, great recycled plastic bottle project. This could be pretty if you used wine bottles. It's just a matter of figuring out how to cut a hole in the side.