Biscornus are adorable objects made by attaching two squares of fabric to each other with a 45 degrees rotation angle. It can be a bit tricky to predict how it will look from just square patterns, so here's a preview tool!
This page uses a framework called ThreeJS, which makes it really easy to make 3D scenes in a webpage. All the Javascript is directly readable in this page's source code if you're curious.
See page source for details. The informal version is that you can do whatever with the code but need to make your modified version available in some way.