Here’s a color palette based on your query with the specified colors and additional harmonious shades:

### Color Palette: Midnight Elegance

1. **Midnight Blue**
   - **Hex Code:** 
                            
                            #2C3E50
                        
   - **Description:** A deep, dark blue that evokes the tranquility of a midnight sky. It serves as a strong base for the palette.

2. **Metallic Silver**
   - **Hex Code:** 
                            
                            #C0C0C0
                        
   - **Description:** A sleek and reflective silver tone that adds a touch of elegance and sophistication to the palette.

3. **Pure White**
   - **Hex Code:** 
                            
                            #FFFFFF
                        
   - **Description:** A crisp and clean shade that provides contrast and brightness, enhancing the overall palette.

4. **Steel Blue**
   - **Hex Code:** 
                            
                            #4682B4
                        
   - **Description:** A medium blue with a hint of gray, adding depth while maintaining the cool tones of the palette.

5. **Charcoal Gray**
   - **Hex Code:** 
                            
                            #34495E
                        
   - **Description:** A rich, dark gray that complements the Midnight Blue and enhances the modern feel of the palette.

6. **Light Silver**
   - **Hex Code:** 
                            
                            #D3D3D3
                        
   - **Description:** A soft, light silver that adds a gentle touch, harmonizing beautifully with both the Metallic Silver and Pure White.

### Palette Overview:
This palette is characterized by its cool tones, combining the depth of Midnight Blue and Charcoal Gray with the brightness of Pure White. The addition of Metallic Silver and Light Silver brings a sense of modernity and elegance, making it perfect for designs that seek to convey sophistication and tranquility. Whether for branding, web design, or interior decor, this palette offers versatility and a timeless appeal.