When arranging colors for a crochet granny square, it's helpful to consider contrast, balance, and personal preference. Here's one suggested order using the colors you provided:
- Black - Starts with a strong, bold contrast.
- White - Follows with a bright, light color that contrasts well with black.
- Grey - Acts as a neutral that bridges the gap between black and blue.
- Blue - Adds a cool color that can provide a nice finishing touch.
This order creates a balanced and visually appealing transition between the colors. However, feel free to switch them up based on your own style! You might try different combinations to see what you like best.