List of Letters

{| class="wikitable" !Episode !Season !Title !Letter !Letter from our Friends
 * 1.
 * 1x01
 * Mr. Salt and Mrs. Pepper Day
 * Letter_(Mr._Salt_and_Mrs._Pepper_Day).jpg
 * Christine Yaptangco and Brian Duncan
 * 2.
 * 1x02
 * Café Blue
 * Letter_(Cafe_Blue).jpg
 * Valerie Riccardi, Ivory Yorker and Cory Radisch.
 * 3.
 * 1x03
 * What's That Sound
 * Letter_(What's_That_Sound).jpg
 * Karina Alfaro, Matthew Holsten and Cara Schank.
 * 4.
 * 1x04
 * Blue's Big Treasure Hunt
 * Letter_(Blue's_Big_Treasure_Hunt).jpg
 * Kaiya Coursey, Michael Lynch and Nicholas Timmins.
 * 5.
 * 1x05
 * Blue's Surprise at 2:00
 * Letter_(Blue's_Surprise_at_2-00).jpg
 * Spencer Krug, Ryan Rodriguez and Chelsea Smith.
 * 6.
 * 1x06
 * Adventures in Art
 * Letter_(Adventures_in_Art).jpg
 * Aleisha L. Allen, Jibreel Champion and Taylor McKelvie.
 * 7.
 * 1x07
 * Colors Everywhere!
 * Letter_(Colors_Everywhere).jpg
 * Danielle Brown, Heidi Fayes, Richard Smith and Mark Johns.
 * Aleisha L. Allen, Jibreel Champion and Taylor McKelvie.
 * 7.
 * 1x07
 * Colors Everywhere!
 * Letter_(Colors_Everywhere).jpg
 * Danielle Brown, Heidi Fayes, Richard Smith and Mark Johns.
 * Danielle Brown, Heidi Fayes, Richard Smith and Mark Johns.