For all you paper crafters and snail mailers out there, this book may be of inspiration to you. I've already been a fan of Ebony's work and blogfor years now and really admire her cute handmade ideas, so naturally, I had to get my hands on her Craft Idea Book (Japanese Version).
This book is full of fun designs, how-to guides, colorful projects, and easy to follow instructions (despite it all being in Japanese).
Whenever I'm feeling stuck on how to design my snail mail letters, I just refer back to this book. (These envelopes here were inspired by Hello Sandwich back when I had loads of weekend crafting time.) And although this book is no longer available within the Hello Sandwich shop, you may be able to find them through other bookstores on Amazon.