i built some blinky boots with m4cr0. he will wear them at the #38c3 cert (albeit less aggressively flashing) so keep an eye out for them.
the boots are based on a bastardized version of the current rudelblinken prototype with a lot of shoe specific code and without the wasm runtime. #cccda
I built a parametric version of the classic 3d printed cat ears. And also a tool that lets you easily customize OpenSCAD files from the internet (Basically just a stripped down version of the OpenSCAD playground).