The author, Jodi Fukumoto, thought this out. Money fold is perfect for gift so why don't I put envelopes and boxes origami models ? The viewers do not need to think about gift wrapping.
Here's details of this book:
The Guide to Hawaiian-Style Money Folds
By Jodi Fukumoto
Published: 2003 by Island Heritage
I recommend this book for someone who can paper cranes or so. The instruction is good but if you are buying this book for your first book, you might find it difficult to follow.
For educators you will find the way to introduce Hawaii with this book. Fukumoto has another origami book "The Guide To Hawaiian Style Origami", which use ordinary paper instead of dollar bill.