On Sugabelly's blog, She put this up;

basically, you're supposed to write a letter to the following people:

Day 1 — Your best friend.
Day 2 — Your crush.
Day 3 — Your parents.
Day 4 — Your sibling (or closest relative)
Day 5 — Your dreams.
Day 6 — A stranger.
Day 7 — Your Ex-boyfriend/girlfriend/love/crush.
Day 8 — Your favorite internet friend.
Day 9 — Someone you wish you could meet.
Day 10 — Someone you don’t talk to as much as you’d like to.
Day 11 — A Deceased person you wish you could talk to.
Day 12 — The person you hate most/caused you a lot of pain.
Day 13 — Someone you wish could forgive you.
Day 14 — Someone you’ve drifted away from.
Day 15 — The person you miss the most.
Day 16 — Someone that’s not in your state/country.
Day 17 — Someone from your childhood.
Day 18 — The person that you wish you could be.
Day 19 — Someone that pesters your mind—good or bad.
Day 20 — The one that broke your heart the hardest.
Day 21 — Someone you judged by their first impression.
Day 22 — Someone you want to give a second chance to.
Day 23 — The last person you kissed.
Day 24 — The person that gave you your favorite memory.
Day 25 — The person you know that is going through the worst of times.
Day 26 — The last person you made a pinky promise to.
Day 27 — The friendliest person you knew for only one day.
Day 28 — Someone that changed your life.
Day 29 — The person that you want tell everything to, but too afraid to.
Day 30 — Your reflection in the mirror.

I find this intriguing, because sometimes when you write letters, you discover thoughts and feelings you didnt even realise you had. So my next post is...