It seems that most young children are naturally collectors. My daughter is no different.
When we were reading an issue of a High Five (Highlights, but for younger children...we definitely like it), M was excited to see the craft idea of making a treasure box.
She really enjoyed the process. M is four years old, and it was definitely a one-on-one project since she needed help alternating the craft sticks. (Thankfully E was not overly interested.)
I definitely recommend creating a treasure box with your little collector!
We decorated with a simple "M" and a sticker jewel on the top. A foam sticker cross decorates the interior of the lid.
M was very proud, and she still loves her homemade treasure box.