I found these cute knobs half off at Hobby Lobby today! They were $1.50 each.
I decided I needed a touch of whimsy. My house doesn't really have any lighthearted, bright decor. Rainbow polka dot knobs are about as whimsy as I get. Ha ha. I like whimsy, I just don't know how to do it very well or make it fit in with my house.
I simply measured how far the first hole was from the edge, and drilled one to match on the other side. Then I measured in between both holes and divided it in two. Not rocket science, but better than guessing and making it lop sided! :)