How to establish a simple yet warm bathroom design:

1. Neutral Color Palette: Start with a neutral color palette that includes warm shades like soft beige or light gray for the walls. This creates a cozy and inviting atmosphere.

2. White Fixtures: Choose a sleek and modern white toilet that complements the overall design.

3. Wood Accents: Introduce natural wood elements for warmth. This could be in the form of a wooden vanity, shelving, or even a wooden frame for the bathroom mirror.

4. Soft Textures: Incorporate soft and plush textures through items like a fluffy white bath mat, towels.

5. Warm Lighting: Opt for warm and soft lighting fixtures, such as wall sconces or pendant lights, rather than harsh overhead lighting. This creates a welcoming ambiance.

6. Artwork or Decor: Hang a piece of artwork or a decorative mirror on the wall to personalize the space and add visual interest.

By combining these elements, you can create a simple yet inviting bathroom design with a white toilet and bidet set as its centerpiece.