In the figure below, I want to draw attention to the (irregular) hexagons formed by the boundary and some of the interior segments. Currently, they are lightly shaded grey, but I think they don't stand out enough. How can I make them stand out more, without changing the colour of the lines?
The perfect solution would:
- Leave all current elements of the figure (except for the shading) intact and recognizable.
- Not use any colours except for those already in the figure, or #70E500 and #E1004C (possibly desaturated).