Here’s a revised color palette for your Gantt chart using more vibrant colors, ensuring to avoid both red and green:

 < Vibrant Project Color Palette Without Red and Green >
1. Project Azure - 
                            
                            #007FFF
                         - A bright azure blue that conveys energy and clarity, making it perfect for a dynamic project.
2. Project Golden Yellow - 
                            
                            #FFC107
                         - A bold golden yellow that radiates positivity and attention, ideal for a project that stands out.
3. Project Coral - 
                            
                            #FF6F61
                         - A vibrant coral that adds warmth and enthusiasm, fitting for a collaborative and engaging project.
4. Project Amethyst - 
                            
                            #9B59B6
                         - A rich amethyst purple that symbolizes creativity and luxury, well-suited for an innovative project.

This vibrant palette will help each project pop visually while maintaining clarity in your Gantt chart.

Do you have any specific preferences for project labels or progress indicators to complement these colors? Or would you like additional suggestions for visual elements?