Created entirely in a pixel shader with raymarching.
Shaders used:
IQ's Palettes https://www.shadertoy.com/view/ll2GD3
IQ's Primitives https://www.shadertoy.com/view/Xds3zN
Knighty's Polyhedra https://www.shadertoy.com/view/MsKGzw
Kali's Star nest https://www.shadertoy.com/view/XlfGRj
JoshP's Simplicity https://www.shadertoy.com/view/lslGWr
Iapafoto's Interactive thinks https://www.shadertoy.com/view/Xt3SR4