I made lovely dryer balls. Yup, old socks(roll one sock in the other) and essential oil(15 to 20 drops inside the "ball"((I used tangerine essential oil because it was cheap and all I had))). I wrote on them so no one would try and put them away. Not that anyone ever does laundry but in the hopes that someone will get the urge, they wouldn't put these old socks back. I labeled the first one "DB" well for dryer ball and then I named the other one "Cooper." I live only to make myself laugh.
I would like to say that if you write on your homemade dryer balls with permanent marker, you are going to have to wash them. Smelly, smelly.
This really did make the clothes smell, orangey. And I was shocked at how much faster everything dried. I think I will be adding a few more of Cooper's balls to the dryer.