Via this substratum theme you can change the edge light notification to a few colors and custom image textures. Some are shown as examples above.
How to apply overlays:
1. Select the desired edge light
2. Build and install
4. Substratum > Manager Tab
5. Select the overlay and enable it.
Apk is attached below
1.0 - Initial Build
I will be adding more colors/textures. If you guys have any ideas also, let me know.