The key point of choosing glasses for square faces is to soften your features. Therefore, in terms of the color of glasses, here are some options for you:
1. Tortoiseshell: Tortoise shell glasses are classic, and they can help to soften your features and make you look more approachable.
2. Brown: Brown glasses can help to make you look more relaxed and down-to-earth.
3. Black: Black glasses are a good choice if you want to make a strong statement. They can help to make your face look thinner and your features more defined.
4. Clear: If you want to show off your eyes, clear glasses can help to make your face look more open and inviting.