<Vibrant Harmony> 
1. Forest Green - 
                            
                            #228B22
                         - A deep and rich green that represents nature and balance, grounding the vibrant colors. 
2. Coral Red - 
                            
                            #FF6F61
                         - A warm, vibrant red with orange undertones, reminiscent of coral reefs and tropical sunsets. 
3. Sky Blue - 
                            
                            #00BFFF
                         - A bright and cheerful blue that reflects clear skies, providing freshness and energy to the palette. 
4. Golden Yellow - 
                            
                            #FFD700
                         - A bright, sunny yellow that adds a cheerful accent and complements both red and green beautifully. 
5. Soft Lavender - 
                            
                            #E6E6FA
                         - A light, pastel purple that introduces a calming balance, harmonizing the vibrant tones. 

The “Vibrant Harmony” palette combines lively red, green, and blue with complementary shades, creating a dynamic yet balanced visual experience. This palette is ideal for posters or designs that aim for a lively, engaging atmosphere.

What specific message or theme are you looking to convey with your project? Would you like to tweak any of the colors or explore different combinations?