Or, of course, you could use things like lavender, rose petals, calendula, orange peels … the list goes on and on.
How to take an herbal bath: While you could make little herbal bath bags, my new favorite way is to brew a very strong tea ahead of time using the herbs (and essential oils, if I want an extra kick). Brew 1-2 cups of very strong herbal tea. Strain and add it to your running bathwater. Then, take the remaining brewed herbs and place them in the middle of a washcloth. Gather the washcloth together at the top and tie tightly with a string or a hair tie. Leave it in the bath as you soak, and then scrub well with it before getting out of the tub.