This two-in-one sandbox picnic table combo is just gorgeous. When you cover the top, it is just a regular picnic table with beaches. When you remove the cover, and fill in sand, it is a wonderful sandbox that kids can enjoy all day long.
Of course, instead of filling the box with sand, you can use the box as a mini storage for anything that you want to keep in that space. Here is another great example.
And here is the plan for how to build such a table.