For the beach house* river rocks in a box + garden hose = clean feet what a great garden idea! Placed in the sun will heat the stones as well. Great way to wash off little feet covered with grass and dirt before coming inside.
If you were to use drift wood this would be awesome for a beach reception style thing. Very natural, but striking. Drill holes in wood, place tea lights. Beautiful outdoor table center piece for the picnic table---AROUND THE GARDEN POOL
Many items can be reused and repurposed for seed starting containers. Empty cardboard egg cartons, and even egg shells themselves make great little seed starting pots - and can be popped right into the garden at planting time!