Blue is a cool color, which can give people a fresh and quiet feeling. When matching the plaque and door of the car beauty shop, you can consider the following color matching:

1, white: White is a common collocation color, which can make the whole room look brighter and cleaner. The combination of white and blue can also make people feel relaxed and comfortable.

2, gray: gray is a relatively neutral color, suitable for matching blue. The combination of gray and blue can create a stable and scientific atmosphere.

3. Yellow: Yellow is a warm and bright color, which can be in sharp contrast with blue. The combination of yellow and blue can create a sense of vitality and fashion.

4. Green: Green is a natural and comfortable color, which can form a harmonious atmosphere with blue. The combination of green and blue can create a fresh and natural feeling.