1. Incorporate natural elements: Consider incorporating natural elements like plants, wood, stone, or water features into your design. These elements can bring a sense of calm and tranquility to your space while also adding a unique touch.

2. Use color to create contrast: Use contrasting colors or patterns to create visual interest in your space. For example, you could use bold, colorful wallpaper on one accent wall and pair it with neutral furnishings and decor.

3. Add statement lighting: Consider adding statement lighting fixtures like chandeliers, pendant lights, or floor lamps to create a focal point in your space. These fixtures can also add an element of drama and elegance to your design.

4. Mix and match styles: Don’t be afraid to mix and match different design styles to create a truly unique look. For example, you could combine modern and traditional elements to create a transitional design style.

5. Create functional spaces: Consider how you can make the most of your duplex space by creating functional areas for different activities. For example, you could create a cozy reading nook in one corner and a dining area in another.

Overall, the key to creating a unique duplex CCL interior design is to think outside the box and incorporate your own personal style and preferences into your design.