What is a good hand cipher?

What is good hand cipher that is easy to use? By this, I mean a cipher that I can encrypt and decrypt by hand. I am looking for something more complicated than a monoalphabetic substitution cipher (replace letters with different letters. EX: HELLO -> GTMMV) and not as well known as the pigpen cipher. Security really isn’t an issue – If I was looking for a secure cipher, I would be using something like DES.