Custom colours desperately needed

Already it is Sunday afternoon and I am finding myself straining at the screen trying to find that widget in my already-substantial prototype. I would be a welcome addition if we could have custom colurs for widgets and fields. Maybe some other way to make the type of widget or cell recognizable, to free up the colour?

I am not sure what you mean: Use custom colours like the labels in the Finder of previous macOS-versions? Or change the icons used for for the various cell-types?

I don’t mind. Anything you can provide in addition to the orange and blue squares, perhaps? Something that I can add to go in front of those? A custom icon or just a simple dot with a colour, similar to the tags in macOS?