For the older kids
I found this Fruit of the Spirit memory verse printable booklet at Thinking Kids Blog. This will go along perfect with the letter and printable I am printed out the Defining the Fruit of the Spirit
For the smaller kids
I found some really cute stickers at Mardel to decorate the envelope with. I bought these bookmarks from Mardel a while back I am going to include.
As Jill suggested I plan to spread out this topic into a series with each letter focusing on a different fruit of the Spirit and send a booklet with each letter.
I found this fruit border clip art to print on my letter.
Galatians 5:22-23 says "But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control."