The Hawaii-based IndiePopShop on Etsy provides instructions on how to make an adorable kid's skateboard picnic table and if you're up for the challenge, it's assembly is described as "more difficult than IKEA, easier than custom cabinet building."
As well as four recycled skateboards, the craft requires some 2x4 wood and a few basic tools to put it all together. With the skate decks forming the tabletop surface and the seats, it's a small table that's best suited for kids under the age of five. Naturally, skate decks are designed to get a little beat up, so the table should be able to withstand whatever kids put it through too.
IndiePopShop supplies PDF instructions for $17, but if you find this project a little daunting, there's also the option to purchase a pre-made version.