After seeing a successful Kickstarter project, Angus from Makers Muse has been experimenting with sphericons, unusual shapes that meander when they roll.
For those who want the pattern, it's here:
These objects look funky and actually roll with a really cool motion (most of them anyway)! Files arranged, nested and ready to print. Depending on how close your first layer is to the build plate you may need to carefully trim or and the edge to ensure smooth transition between the two halves. Parts should snap together with the insert, however some small sanding or glue may be required depending on your machines achievable tolerance.