This is a very easy and fast DIY that you can do in between cooking, playing with you kids, wast... er, conducting important research online, brushing teeth... You get the picture!
Originally, I was going to use craft popsicle sticks, but then I realized that I probably don't want to have wood (even if it's painted) potentially touching water, so I changed to caulking tape, but you can, of course, use whatever you think will work. The point is to have something that will give you a nice architectural relief, but will not be too bulky.
So, let's start:
Wash your pot very well. This is important, and most DIY instructions skip this step, either because they assume it's self-evident or for some other reason. The dirt will prevent paint and tape adhering properly.
Measure how long your tape pieces need to be, and how many you will need and cut that number of strips.
Starting at the top, adhere one strip to just under the lip of the pot and smooth out downward, making sure your strip goes straight down. Repeat with the rest of the strips, placing them evenly. I placed the strips about 1/2 inch apart.
Let dry, especially if you used popsicle sticks or anything else that required glue.
Place the pot upside down in your spraying area and spray one coat of paint on. Let dry, then spray the bottom sides of the pot again (did that make sense?). The reason for that is that we will be flipping the pot the right way up and laying several coats both on the inside and outside, so you want it to be pretty even, but not too thick. If you put too many coats of paint, the paint might chip and flake.
Let dry, then flip the pot right way up. Spray the top inside and outside. In most cases, you'll only need one coat for the inside, and only really on the top, because we don't care what the pot looks like inside, under all the soil, so don't bother with that.
Let dry for 24-48 hours and enjoy!