It's not natural, but if your hair is on the lighter side or is medium colour, you can use shock dyes (manic panic and similar) in certain colours. I think violets and reds work without bleaching. Any darker colour probably will take, but they might not look like you want them without bleaching. But purples and reds, maybe even dark pinks could work, depending on your own colour. Light colours (grey too, I'd think) probably demand bleaching first.
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