Keep the red theme of the icons on quick settings and home screen and lock screen intact , it is still ok with nothing os 3.4 or something the latest 4.0 has been revamped and evryt thing got a new minimal red chade
Keep them red and black or red and white ,it suits the nothing aesthetics better


And also when gaming mode is open the notification icons of apps shown are coloured even though the nothing native icon pack is being used