I have redone the hedgehog mandala. As a demonstration, I am showing it against various backgrounds. I like to create them against the cyan background because I like to absorb that color while working.
Next, I created a grid with dark blue lines on a lighter blue background.
With a couple of clicks of a button, I was able to invert the background to light lines on dark. Wait, we are not done yet.
I then took that inverted background and changed the hue to green. I could choose any color I wanted. Perhaps, this gives you more of an idea of the possibilities when it comes to designing backgrounds.