Here’s an expanded vibrant and playful color palette with a total of eight colors, perfect for a cartoony aesthetic:

 <Cartoon Brights>
1. Sunny Yellow - 
                            
                            #FFC340
                         - A cheerful and warm yellow that evokes happiness and energy.
2. Bubblegum Pink - 
                            
                            #FF5378
                         - A vibrant pink that adds a playful and lively touch to the palette.
3. Sky Blue - 
                            
                            #00BFFF
                         - A bright and refreshing blue that brings a sense of calm and fun.
4. Lime Green - 
                            
                            #A8E600
                         - A zesty lime green that adds a pop of freshness and excitement to the design.
5. Orange Slice - 
                            
                            #FF8C00
                         - A bright and tangy orange that enhances the playful nature of the palette.
6. Lavender Purple - 
                            
                            #E6A9E0
                         - A soft and whimsical lavender that introduces a gentle sweetness to the palette.
7. Bright Coral - 
                            
                            #FF6F61
                         - A lively coral that brings warmth and vibrancy, perfect for playful designs.
8. Turquoise Teal - 
                            
                            #00B2A9
                         - A vibrant teal that adds a refreshing and energetic vibe, complementing the other colors beautifully.

This expanded palette provides a wide range of colors that can work well together, creating a lively and engaging design suitable for cartoony themes.

Would you like to explore specific design applications for these colors, or do you have any other themes or color combinations you want to discuss?