Suggestion: Transparent "color".

[DualBrain]

I'd like to see the option so specify one of the colors as "transparent" and have it render in the drawing surface as such - maybe as a checkerboard pattern (black and white) instead of having to draw everything with the blinding magenta color (as an example). The alternate to this would be that there is always a "transparent color" in the color swatch and that "color" is replaced (when necessary) with a real color when exporting to file types and/or source generation that don't support transparency.