Currently loving this book Handmade Packaging Workshop from Rachel Wiles. I was lucky to pick up a copy of this book from a local bookstore. I have always been curious of the processes involved in conceptualising designs for product packaging with a handmade touch.   If you're a crafter, online seller, baker or someone who loves to make homemade gifts, this book is a great resource. 

Plenty of great ideas on how to design your own gift tags for product packaging  or holiday gift giving

Handmade packaging has a certain look and this book gives wonderful tips even if you are aiming for mass production

The book has step-by-step guides on how to make surface designs on Adobe Illustrator. Even novices can give these exercises a try!