• 1 cup crushed, dried herbs (rosemary, southernwood, and lavender are good choices)
• 1 teaspoon ground cloves
• 1 teaspoon cinnamon
• 1 teaspoon baking soda
• Combine ingredients, and sprinkle over carpet. Allow to sit for a few minutes, then vacuum.

Here are a couple variations of that mixture:

• Mix 1 small box baking soda with your favorite potpourri oil, using just a few drops, and sprinkle on as carpet freshener. Leave on a carpet 10 to 20 minutes, then vacuum.
• Use 1 cup baking soda, 1 cup cornstarch, and 15 drops essential oil fragrance. Leave on carpet 10 to 20 minutes, then vacuum. Store mixture in a glass jar or airtight container.