Brighten Someone's Mailbox

I saw this display at my local post office and thought it was a great reminder to send out some handwritten cards to those you love.  I'm currently working through a list of family and friends that I wanted to send snail mail to this month.  I love getting real mail and I know it brightens my day to get something personal in the mail.  Who could you send a card to today??  Wouldn't it be fun if you were able to brighten someone's mailbox??