I used some plain terracotta pots, Rust-Oleum chalkboard paint and some painter's tape.
Tape your pot to protect it from excess paint, then go to town! I used 3 quick coats of spray paint, but it dried in less than 15 minutes.
When the paint is dry, remove the painter's tape and whip out the chalk! As long as Jack doesn't learn to lick the sides of my pots, this might just be the one of the best things ever.