"Open when..." envelopes! These are perfect for military deployments or long distance relationships, etc. I grabbed 10 envelopes and put hand written letters in each of them, some with little treats. I also made an 11th envelope for just pictures!
Open when you're mad letter. Bible verse- "In your anger do not sin. Do not give the devil a foothold. Do not let any unwholesome talk come out of your mouth, but only what is helpful for building others up." Ephesians 4:26-29