I combined the wonderful looking bags from Kusmi tea with the idea of the quotes from Yogi tea, and filled the bags with lavender, and voilà I nice little gift for your pen pals.
These lavender sachets fit the dimensions for my flat project, just don't overfill the bags (wink).
I hope this inspires you to make some of your own, and send out nice smelling letters. Instead of quotes you can always write wishes or more personal messages, that is entirely up to you.
Wishing you a lovely and crafty day,