Rhubarb
Use 1/4 cup chopped, fresh rhubarb and add to 2 cups of boiling water. Cool and strain before using.
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Chamomile flowers
Pour 2 cups of boiling water over 1/4 cup of chamomile flowers. Cool and strain before using.
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Clarifying citrus rinse
Boil the rinds of 2 oranges and 2 lemons for about 10 minutes. Cool and strain. This removes residue as well, and helps control oily scalps.
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Lavender, sage, or cinnamon
Any of these will give you dark highlights. Add 1/4-cup sage or lavender, or 3 broken up cinnamon sticks to 2 cups of boiling water. Cool and strain.
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Hibiscus flowers
These flowers will give you lovely red highlights. Use dried flowers or herbal tea containing hibiscus. Steep the mixture to a shade you like, then cool and strain before using.