White is a colour the perception of which is evoked by light. Since white is the extreme end of the visual spectrum, and since white objects such as snow, clouds and flowers, appear often in nature, it has frequent symbolism. Human culture has many references to white, often related to purity and cleanness.
Snow and ice are normally white due to the diffusing structure of transparent water ice crystals. The same is true for many types of clouds where droplets of water diffuse the white light from the sun. Beaches with sand containing large amounts of quartz also appear white.
White is frequently associated with both purity and peace. This symbolism has long roots as seen by the white dove emerging from Noah's ark. The white ribbon is worn by movements denouncing violence against women and the White Rose was a non violent resistance group in Nazi Germany. The White flag is an International sign of either surrender or truce, that is, it is a sign of peaceful intent.
In Western weddings, a white dress is thought to be symbolic of purity. In Japanese weddings white is thought to symbolise the "death" of their former family and their introduction into a new family. In English heraldry white symbolised brightness, purity, virtue and innocence.
Of course the colour white is frequently used in craft, both as the only or dominant colour and also as a complimentary or contrasting colour. My Sterling and White Crystal Wired Watch pictured above is a great example of white being used as the only or dominant colour.
Here are some more examples from the Jet Team:
and from members of the BrisStyle team: