When you think of these countries, you think of that warm sun, as a result, the interior design style uses a more minimalistic approach with white wash walls and ceilings; this is to help the interior feel cool, aerated, fresh and open.
For example; to demonstrate this change in colour difference, interiors in Greek design will use cooler, vibrant tones like blues, greens and turquoise colours, where as in Italy they use earthier, warmer tones, like oranges and reds.
In contrast, the Spanish colour palette also follows a natural approach, combining the cooler Greek style of blues, browns, whites and greens with the orange, red and terracotta tones commonly associated with the Italian palette.
The Principle behind creating a Mediterranean interior is quite simple, for a base, white wash walls, with hardwood or terracotta tiles/stone flooring tends to be a typical foundation for all the interiors.