Yoga students seem to love the lavender spray that I put on small washcloths and place over their eyes during Savasana. In fact, once, I had run out of spray and my, oh my, the groans of disappointment! Some people don't care for lavender, so if I have a new student, I'll usually say, "If you don't like lavender, just place your hand on your chest". Here is the recipe I use, which I found on Pinterest:
Lavender Spray: 2 cups distilled water, 1 oz (2 tablespoons) vodka, 1/2 teaspoon lavender essential oil. (Can use up to 3/4 teaspoon lavender oil depending on how strong you like it.) Pour into a spray bottle and shake each time you use it to mix thoroughly. If you don't have vodka, you can use rubbing alcohol, but I have found that it smells too alcoholly. The vodka is odorless, and acts as a preservative as well as help to emulsify (mix) the essential oil with the water.
Another recipe I use is for a more natural yoga mat cleaner. It's a good idea to clean your mat frequently, allowing it to dry completely before rolling it up for transportation to class. This is where I got my recipe: Homemade Yoga Mat Cleaner
Yoga Mat Cleaner: 16 drops tea tree oil, 16 drops essential oil (I chose Lemon, but Lavender works well also), 8 drops eucalyptus oil, 3 oz witch hazel or vinegar (I prefer witch hazel - the alcohol free version which you can buy here: Amazon), and 10 oz water, combined in a spray bottle.