Larger - Light-medium colors or large format tiles
Smaller - Medium-dark colors or small format tiles

Lighter - Light-medium colors
Darker - Medium-dark colors (dark colors work best in rooms with plenty of natural light)

Warmer - "Warm" colors
Cooler - "Cool" colors

Neutral color - Larger tiles with coordinating grout joints or stone tile with thin coordinating grout joints
Color accents - Inset color using field tile or decos

Larger with a visual flow - Using the same tile from room to room
Distinctive rooms and areas - Change the size, the direction or use decos

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