Eventually this one, with graduation on rule maybe centered (currently graduation is left aligned)
Concerning other subjects I saw in this topics, there’s too much to give my opinion for all points, but the most important I saw:
This is why, 10years after the last floppy disk was produced, most software still use it as icon for Save action 
I’m not sure that younger than 20~25yo really had one in their hands and used it 
So I can understand that heavy modification could disturb users but it doesn’t means that interface can’t evolve…?
There’s might be a happy compromise we can find for this 
I disagree for this point… I’m personally not fan of having multiples colors in user interface.
When I’m drawing, I prefer a neutral interface without too much distraction around my canvas.
But, it’s a point of view.
That’s the difficulty for designers and developer: there are almost as many views as users
May be, the solution could be:
- A theme with simple monotone and more modern and stylized icons like @EyeOdin made
- A theme with colored icons like @tom proposed, maybe the current one with slight modifications
And let the the user decide in settings which theme he prefer to use.
I know this solution could be disturbing too… and it may need some work, but it’s just an idea.
And if interface is completely redesigned as we can see in proposals from topic Krita UI Redesign topic, some changed icons won’t be the major problem for users, documentations and videos that already exist
Grum999