Here are some examples of how it can be used:
* Les fleurs blanches: The white flowers.
* Les pages blanches: The blank pages.
* Les robes blanches: The white dresses.
It can also be used figuratively:
* Une page blanche dans ma vie: A blank page in my life (meaning a new beginning).
The word "blanches" can also be used as a noun, meaning "whites" (referring to the white part of the eye, for example). However, this usage is less common than the adjective form.