Carla Sonheim, an artist / illustrator that I much admire, sent a really fun newsletter with three good reasons why one-liners matter. One-liners are drawings you do with one line, never raising your drawing implement from the page. I included Carla's idea of one-liners in my Sketchbook Practice online class. Here are a few of my one-liners - of CHICKENS, of course!
Here are Carla's two elephants:
Carla's Special Newsletter here. And try some one-liners, for fun, or for any of the reasons Carla gives you.