Vellum envelopes! What's the best thing about them? They're transparent! I love to use them. Morgan used them for her Princess Valentine Letters. It was cute to see the valentines, heart stickers and hair bands show through the envelopes.
First you need fun things that will look good showing through the vellumn...
Aha! It can be mailed with one stamp.
And then repeat!
...perfume bottle glitter note card, matching notebook, a tiny envelope hold-a-heart-shaped Scripture verse, paper doily, pink flower confetti, and a shoe charm. Leave the emery file off -- it wants to tear the envelope.
It's over one ounce -- so it needs an extra-ounce stamp.
You may prefer using white envelopes. I may have fun using a variety of them. Each way gives the same amount of encouragement.
Remember, “Those who are happiest are those who do the most for others.” — Booker T. Washington