Here is a vibrant and playful color palette inspired by cartoon themes, incorporating the specified brown along with the base color:

 <Cartoon Vibes>
1. Deep Red - 
                            
                            #771102
                         - A bold, rich red that captures attention and adds energy.
2. Chocolate Brown - 
                            
                            #4E3B31
                         - A warm, deep brown that provides depth and a grounded feel, perfect for cartoon characters.
3. Bright Yellow - 
                            
                            #FFEA00
                         - A cheerful, sunny yellow that evokes joy and optimism, commonly used in cartoons.
4. Sky Blue - 
                            
                            #00A3E0
                         - A bright, engaging blue that adds a refreshing contrast and evokes a sense of fun.
5. Grass Green - 
                            
                            #66B65D
                         - A lively green that brings a touch of nature into the cartoon world, adding vibrancy and life.

This color palette combines warm and inviting colors that are ideal for cartoons, encouraging a playful and energetic atmosphere.

Would you like to explore specific applications for this palette, such as character design, backgrounds, or UI elements?