Secret Message Letter

I thought it might be fun to exchange messages written in code. In this swap, you'll have one partner to write a message in some kind of code. It can be a new alphabet or a "read every other line" or a certain number is a certain letter, or the pieces are cut up and need to be rearranged... Or any other thing you think of... Make sure you put in a key for your partner to be able to decode what you wrote. Write a letter that's at least one A5 page long. The subject can be about anything.

Newbies allowed with a filled in profile.