Here’s an updated color palette with a new color replacing Mustard Yellow:

 <Aesthetic Black & White>
1. Black - 
                            
                            #000000
                         - A deep, rich black that provides a strong foundation and contrast.
2. White - 
                            
                            #FFFFFF
                         - A clean, pure white that creates space and balance.
3. Soft Gray - 
                            
                            #B0B0B0
                         - A gentle gray that adds depth without overwhelming the palette.
4. Sage Green - 
                            
                            #A8B400
                         - A soft, muted green that brings a natural and calming element to the palette.
5. Deep Navy - 
                            
                            #001F3F
                         - A sophisticated navy blue that introduces a sense of stability and elegance.

This palette maintains the aesthetic black and white theme while adding sage green for a fresh, tranquil accent and deep navy for sophistication. It creates a harmonious and professional look, perfect for a dynamic report.

Would you like any additional suggestions or tips on utilizing this palette in your Excel report? Or is there anything else you would like to adjust?