<Extended Accent Color Palette for Monochrome Furnishings>
1. Teal - 
                            
                            #008080
                         - A sophisticated blend of blue and green that brings a calm and serene vibe.
2. Lavender - 
                            
                            #E6E6FA
                         - A soft and soothing shade that adds a gentle touch of color without overwhelming the space.
3. Tangerine - 
                            
                            #FF8C00
                         - A cheerful and energetic hue that creates a lively and welcoming atmosphere.
4. Slate Blue - 
                            
                            #6A5ACD
                         - A cool and muted blue that provides a subtle contrast while maintaining elegance.
5. Fuchsia - 
                            
                            #FF00FF
                         - A bold and vibrant pink that can create a striking and modern accent against monochrome furnishings.

This extended color palette offers a variety of accent colors that can complement a black, white, and grey furnishing scheme, each bringing its unique character to the space.

Are there any specific themes or styles you are considering for your space? Would you like to explore any particular color families further?