All you need is a post-it pad and pen, and you’ve got another Valentine’s Day treat that is inxepensive and simple. This idea can be used all year round with different paper designs and shapes, but it’s particularly perfect for February: a sticky-note heart attack is just what the love doctor ordered! Fill each sheet of the pad with a sweet message, leaving the top for the following instruction: “As you pull off each sheet, stick it to the wall!”

Create Your Own Decorations
There is no right way to “heart attack” someone for Valentine’s Day. These hanging hearts are simple and fun: all you need is pink and red paper and several lengths of string. Or apply the hearts horizontally on one longer piece of string for quick and easy decoration in the missionary’s apartment. Other items you can mail include heart-shaped confetti, Valentine candies, paper plates and napkins, doilies, and hand-written notes.

Who doesn't love the look of Fall?
This is a fun and simple craft that is sure to add autumn festivity to your missionary’s day. I found this craft, and detailed instructions, on the following website:
http://www.ehow.com/how_4610766_silk-leaves-that-seem-fall.html
Basically, the effect is achieved by sewing silk leaves together with thread, and then dangling them from the top of a window. Step inside any craft store, and you will easily find the ingredients you need. Include tape, or better yet, hooks (like the Command brand) so your missionary can hang these beautiful decorations.
This idea comes from the following website:

papergardenboutique.typepad.com
We all know that sending real fireworks in the mail is illegal. And if you didn’t, now you do. However, don’t let that stop you from mailing these festive Fourth of July treats! Start with Lifesavers, Mentos, or other round candies that can take the heat. After that, all you need is construction paper, wire and glue to create some completely legal (and delicious) firecrackers!
Winter or Summer — Light up the Nights!