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It was originally envisioned as a home visit booklet project for Book 2, but can also be used for Holy day gifts.
Detailed instructions can be found on Ruhi Resources.
http://www.ruhiresources.org/news/2006/04/25/book-2-activities/practices-booklet-project/
The example shown here has a set of story cards detailing the life of Baha'u'llah, which can be used for both Books 2 and 4 as well for the Birth of Baha'u'llah celebration.