Here's a color palette based on your query that expands the original three colors into a harmonious six-color scheme:

### Color Palette: **Sunny Sky**

1. **Sky Blue**
   - **Hex Code**: 
                            
                            #87CEEB
                        
   - **Description**: A soft and refreshing blue tone reminiscent of a clear summer sky, providing a calm and uplifting feel.

2. **Golden Yellow**
   - **Hex Code**: 
                            
                            #FFD700
                        
   - **Description**: A vibrant and cheerful yellow that evokes feelings of happiness and warmth, reminiscent of the sun shining brightly.

3. **Slate Grey**
   - **Hex Code**: 
                            
                            #708090
                        
   - **Description**: A neutral, slightly cool grey that grounds the palette, adding sophistication and balance to the brighter colors.

4. **Light Coral**
   - **Hex Code**: 
                            
                            #F08080
                        
   - **Description**: A soft, warm coral that adds a touch of warmth and a hint of playful energy, complementing both blue and yellow.

5. **Pale Turquoise**
   - **Hex Code**: 
                            
                            #AFEEEE
                        
   - **Description**: A light and calming turquoise that enhances the freshness of the Sky Blue, evoking feelings of tranquility.

6. **Cream**
   - **Hex Code**: 
                            
                            #FFFDD0
                        
   - **Description**: A soft, off-white cream that adds a touch of elegance and softness, harmonizing with the vibrant Golden Yellow and the cool Slate Grey.

### Palette Overview:
The **Sunny Sky** palette combines refreshing blues and cheerful yellows with grounding greys and soft corals. This palette is ideal for designs that aim to evoke feelings of joy, tranquility, and a sense of balance, making it perfect for branding, user interfaces, or any creative project that seeks to inspire positivity and calmness.