Suggestion for Prioritisation Quadrant view. Background Icons and/or colour

When going to Quadrant view I find myself reading the labels on the quadrants more than I probably should.

Suggest either

• Background image for the quadrant;   such as Exclamation and Clock. They could be large and like a watermark
• or.. colour the quadrants background in some way such as red: important and urgent, purple: important not urgent... etc.

Dragging a task onto a quadrant with a nice big background icon/image would just make it more intuitive and pretty low effort to implement.