Easy. Easy. Easy.

{Step One}
Use masking tape to tape around your pot. Spray with spray paint. I used a glossy black. Use whatever color your heart desires. Place a piece of cardboard under your pot to keep things clean while spraying.
{Step 2}
One more coat of spray paint. Make sure you spray inside the rim up to soil level.
{Step 3}
Let it dry and then peel off that tape! Touch-up any uneven places with a paintbrush. You can spray your spray paint into a piece of crumpled newspaper — it will hold a nice little puddle that you can use a touch-up paint.