What we did was decorate the mailboxes with stickers, just like my younger cousins did. You can use the mailbox however you like, but I thought of the idea of writing letters to each other everyday of February until Valentine's day. Kind of like the 12 days of Christmas concept, but with 14 letters for every day until Valentine's day.
I just wanted to share this cute D.I.Y. with you all. *\(^o^)/* It's very inexpensive! I actually got the mailboxes and stickers from Target for $1 each.