In planning the interiors of large buildings with either small offices or small apartments color can come in as a selling point. Certain colors give the impression of more space. Light blue as in sky blue is one such color. White, off white and light grey can also do the trick. Look around at such buildings and see what you think.
When we look at blue we think of the great waters of the world and also the heavens during daylight hours. It is so easy to imagine openness or, as in the case of dark blue, depth. Also we may think in terms of fluidity and thus movement. Only bad water stands still for any length of time and usually bad water is not blue.
We also tend to think in terms of the female. If the sun is masculine and the moon feminine this isn't so remarkable. After all it is the moon that governs the tides and hence the very necessary movement of great bodies of blue water. We also tend to think of the female form as more curvy and bendable. This does not mean that it is weak, just different from the male. It has its own considerable strength. Water can move mountains. Women can and have ruled over vast empires (Queen Victoria), countries and kingdoms. There is something mysterious about water and hence blue. This comes from the Diana connection as much as anything else.
Blue is a tricky color. It represents lightheartedness, new beginnings, and happy times. However, depending on certain circumstances, it can be a color of depression. It is also believed that wearing the color blue makes you look smart. It's no wonder it's many people's favorite color!