I use wool dryer balls, you can add essential oils if you're looking to add fragrance. It's a nice alternative to the chemically fragrant dryer sheets.
I use these: Mrs. Meyers Clean Day dryer sheets are not only toxin-free, but cute as a button in adorable mid-century-style packaging. The four scents – Lemon Verbena, Lavender, Geranium & Basil – are each fresh, unique and, most importantly, all-natural. But Erin's wool dryer balls are way better for the earth so I will switch to those: )
I switched from dryer sheets to the wool dryer balls too, specifically Friendsheep Cozy Grey Eco Dryer Balls. They make a soft thumping noise as the dryer runs and my socks stick to my microfiber cleaning cloths but other than that, I don't see any difference from dryer sheets so I'm putting them in the win column.