The picture above captures Tibetan prayer flags. These flags can be seen all around Mount Everest. I've included a little exerpt from Wikipedia to explain their significance. The flags are hung in a specific order - Blue (sky/space), White (air/wind), Red (fire), Green (water) and Yellow (earth). Each colour represents one of the five elements and is associated with specific traditions and prayers. They are hung up in sets of five with the blue be at the highest point and the yellow at the lowest.
Traditionally, prayer flags are used to promote peace, compassion, strength, and wisdom. The flags do not carry prayers to 'gods,' a common misconception; rather, the Tibetans believe the prayers and mantras will be blown by the wind to spread the good will and compassion into all pervading space. Therefore, prayer flags are thought to bring benefit to all.
By hanging flags in high places the "Wind Horse" will carry the blessings depicted on the flags to all beings. As wind passes over the surface of the flags which are sensitive to the slightest movement of the wind, the air is purified and sanctified by the Mantras.
The prayers of a flag become a permanent part of the universe as the images fade from exposure to the elements. Just as life moves on and is replaced by new life, Tibetans renew their hopes for the world by continually mounting new flags alongside the old. This act symbolizes a welcoming of life's changes and an acknowledgment that all beings are part of a greater ongoing cycle. - Wikipedia