Supplies: a mason jar, and a bottle of puff paint (I used Tulip's Slick paint), and a small piece of wax paper.
How to: Start painting at the top of the jar so you can hold the bottom and work your way down. If you leave the lip unpainted, you can then hold that edge while touching up the bottom when you run out of room for your fingers. The puff paint just squeezes out of the bottle and the pointed tip makes it easy to draw or write. I free handed this pattern with a mix of dots, lines, and swirls; but you could easily draw out a "pattern plan" to copy off of as you work. When you finish painting, set the jar on a piece of wax paper so any paint near the bottom won't stick to the table surface. Wait 24 hours to let it get nice and dry. And that's it, super easy.
The options for painting on jars are endless. Now that I have a little more experience drawing with the paint bottle, I think I might try writing a phrase on a jar for the kitchen. I also think it would look beautiful in a metallic paint. So many choices.