Sometimes inverting colors works well, at other times it is hideous. Even when I find the result attractive, I still play with the hues and levels of saturation, often in parts of a design at a time, which I subsequently join.
In the Green is now Purple Cloud.
I put Purple Cloud on top of a black and white design and loved the effect after I made some connections. It has a metallic look.
It's All Connected 1
I tweaked the color for another colorway.
It's all connected 2
I shall do more of this combining of very different pieces and making paths, holes, etc. through the top one. I like the effect very much.