I’ve mentioned terrarium cemeteries before, and here’s a similar, equally splendid idea: A miniature meadow featuring a teensy Stonehenge.
This garden is by Two Green Thumbs, a site devoted to miniature gardens. There’s no information on the materials used, but the greenery looks like Irish moss and I suspect that the stones might be made from polymer clay. This would be super-simple to create–you could even go to a hardware store and get flagstones cut to shape if you felt like being particularly authentic–and would be a striking addition to a patio (or even a windowsill if you made it small enough).
The Two Green Thumbs site and accompanying blog are also a wealth of ideas for other miniature gardens, including “fairy gardens:” Full miniature landscapes with tiny furnishings (benches, paved pathways, etc.) and real plants. They’re an interesting cross between dollhouses and gardening, and there’s plenty of ways to make them spooky; indeed, a number of the ideas on the blog are Halloweenish in nature.
This would be a fun, easy project and would also make an interesting gift.
Bonus Link: When I was looking for the source of the original photo I ran across Clonehenge, a site devoted to Stonehenge replicas.
(Hat tip to WitchArachne)