Use the adjective niveous for anything that's the bright white color of fresh snow, like the niveous landscape outside your window on a frosty morning in January.
This literary way to say "snowy white" may come in handy if you want to impress your English teacher or write a flowery letter to someone. You could describe your grandmother's niveous halo of hair or a niveous field of fluffy dandelion seed heads. The word literally means "resembling snow," from the Latin niveus, "snowy," and its root nix, "snow."