Apply paint to the base of your planter. You may have to wait for it to dry before making touch ups.
When you paint the lip of your planter, be sure to paint the inside as well since it will be visible after you pot your plant.
For my decoration, I reused the stamp from my geometric cement planter project. This step really takes a while, so brace yourself! Seal when finished (mod podge works!).
(Side note, color dipped photos make an excellent backdrop!)