Flowlab Discord thread link (to vote)
The original sprite editor was a light theme. When it got updated, it became way better but it is always in dark mode. I think there should be a toggle that makes at least the background grid turn light so that editing or making dark sprites is easier.
I and many others use dark colours frequently in our games, notably Stone Cold Steel and Eldabyss, which I can think of off the top of my head. I believe the grid background being lighter could help a lot of people.
First image attached is the old sprite editor, and the second image attached is the new one so you can compare the colors.