This post is about a design not done by me, but by Kate from minieco.co.uk. I stumbled upon these delightful paper diamonds some time ago, and was amazed by their elegant simplicity.
The shape is just perfect, and they make for truly beautiful toys. I built some myself for my kids, and they loved them very much. They are surprisingly sturdy for paper toys, due to a very clever folding pattern.
You will find the downloadable PDF template and detailed instructions on how to make them at the minieco.co.uk blog, which I highly recommend not only for the diamonds, but for all kinds of very nice projects.