Rule of Thirds, Guide Colors - Suggestion

When using a solid white background, I’ve had some trouble seeing the white guidelines when using the “save a thumbnail” button in the editor.
I realize this seems very minor, and use case-specific but, it got me to think about what in the editor could be improved. I think it would be great to have additional grid options such as the Golden Triangle also giving this feature selectable colors like black or neon colors would be helpful.
Thumbnails are the lifeblood of digital media content, and this may help increase the quality of what people want to show off & sell as well as helping guide newer artists and creators.

Thanks again for the great service you guys provide.