Here is a color palette inspired by a koi illustration:
1. Color name: Koi Red
   Hex code: 
                            
                            #D83B3B
                        
   Description: A vibrant red reminiscent of the vibrant scales of a koi fish.

2. Color name: Koi Gold
   Hex code: 
                            
                            #FFD700
                        
   Description: A shimmering gold like the glimmering scales of a koi fish.

3. Color name: Lily Pad Green
   Hex code: 
                            
                            #4CAF50
                        
   Description: A lush green inspired by the lily pads often found in koi ponds.

4. Color name: Water Blue
   Hex code: 
                            
                            #3F51B5
                        
   Description: A tranquil blue representing the calm waters where koi fish gracefully swim.

5. Color name: Sunlight Yellow
   Hex code: 
                            
                            #FFEB3B
                        
   Description: A warm yellow reminiscent of the sunlight dancing on the surface of a koi pond.

6. Color name: Pond Brown
   Hex code: 
                            
                            #5D4037
                        
   Description: A deep brown inspired by the earthy tones of the pond floor where koi fish dwell.

These colors capture the essence of a koi illustration, from the vibrant hues of the fish to the serene tones of their natural habitat.