This clever project from EcoProjecteer is one of the cheapest and most useful tutorials we've seen in a while. All you really need are a few tools and one of these buckets; you can cut the holes with a hand saw, a Dremel, or, if you are well-equiped, a jigsaw. The project instructions are thorough and helpful and guide you through the process.
And, just for kicks, you can make your swing cheeky like the folks at EcoProjecteer did, and design your swing so the bucket's "THIS IS NOT A TOY" warning is prominently displayed.
Read More: EcoProjecteer