A pattern of diamonds and circles overlaid in several layers.
This pattern is a short distance from the edge of Mandelbrot set (opposite side to the needle) and is the result of using Gaussian Integer maximum distance for colour selection.
Created using mars and expanded using phobos both of which are C++ programs I've implemented using Gtkmm on Linux.
Bailout limit: 16
Iterations: 10 approx
Image centre: 0.493984 + 0.002125i
Long side: 0.170477
Outer colouring: gaussian integer (round) maximum distance