All the 'toys' have been made with the pretty similar ray marching / distance field setup thingy that I put together. It has basic lighting and a bunch of functions for creating different shapes. And a function for repeating the shapes.
https://www.shadertoy.com/view/XdyGRw
https://www.shadertoy.com/view/Mtj3RR
https://www.shadertoy.com/view/XsfSRX
