Card with abstract images painted and drawn by a young child. The words: "Love on you" appear in large letters inside on the lower left.

Letter from a member of the Point Loma Community Presbyterian Church in San Diego, California. The letter reads: "Dear Synagogue, Being God's chosen often includes incredible sacrifice. Too often you are chosen to be the sacrifice for us all. Thank you and bless you, [name illegible]."

Card from a student at West Allegheny Middle School in Imperial, Pa. The front features a hand-colored illustration of a turtle with floral and geometric motifs on its shell, legs, and neck. The back contains a handwritten note, as well as the stock signature: "From your friends at West Allegheny Middle School."

Square card with white and yellow text against blue background. Card reads, "Mitzvah4Pittsburgh. Some spread darkness. We spread light. Choose a good deed. Choose a Mitzvah. Add light to the world," followed by four options and a place for respondents to list their name and email address. Some names and email addresses have been redacted for privacy.

Post-it note with handwritten message in blue marker. The message reads, in Hebrew: "May their memories be for a blessing. May their souls be bound with the bond of life. Sharon, Israel."

Card with mosaic pattern evoking a flame on the front cover. The inside contains a note of sympathy from the board and staff of Mazon, as well information about the organization

Card with photograph of ribbons laid out in a rainbow pattern. The inside reads: "God bless. Sandy and Cheri."

Hand painted card with a rainbow-colored heart on the front. Signed lower right: "Love, Brian S." The card has been laminated.

Note from a member of The Church at Severn Run in Severn, Maryland. The note is enclosed in an envelope with church letterhead, reading: "The Church at Severn Run: Love Well, Live Jesus, Believe Big!" The note inside messages of condolence and prayer. The church's contact information is included on the back of the envelope.

Square card with white and yellow text against blue background. Card reads, "Mitzvah4Pittsburgh. Some spread darkness. We spread light. Choose a good deed. Choose a Mitzvah. Add light to the world," followed by four options and a place for respondents to list their name and email address. Some names and email addresses have been redacted for privacy.

Folded card with marker and colored pencil inscriptions. Cover reads: "Do not cry :-) That is sad." Inside reads: "I am very sad about the bad things that happened to you. I hope this never happens again. Luke [last name redacted for privacy]" and features stylized illustration of two stick figures, representing the writer "me" and the recipients "you guys" holding hands.

Printed label which reads: "Thinking of You. Liberty K-5 students." The label is taped to a piece of clear cellophane.

Folded card with marker and colored pencil illustration. Front and back cover feature spread of tree emerging from blue field. Interior features scribbles and name "Veronica." Additional message reads "Our hearts go out to you at this tragic time, along with our wishes for healing. The Beth Chai Congregation of Greater Washington, D.C."

Four page pamphlet with paragraphs of typed text and headshot portraits throughout. Purple toned text and photographs. Text describes history and mission of Lest We Forget project.

Post-it note with handwritten message in black and red marker. The message reads: "If you mess with us. You mess with the entire world." Signed with a heart, colored in red and outlined in black.

Post-it note with handwritten message in black marker. The note features a quote from Psalm 116:15, reading: "Precious (costly) in the sight of the Lord is the death of his saints."

Handwritten note written in black marker on a manilla envelope. Note is addressed to Tree of Life and contains messages in both English and Hebrew.