I make muslin or monk's cloth pillows filled with Tsuga canadensis; Canadian Hemlock, and also Asperula odorata; Sweet Woodruff. I pre dry the Woodruff because it releases its aroma of new mown
hay more readily when dry.
I re-stuff them each year.
Also, this year I had a Fir for the Christmas tree and used the needles of that for another pillow.
I couldn't access that article but any fragrant herb would work, like Lavender, Rosemary, Sweet Annie, Lemonbalm.