I was looking for an interesting design for a pivot-lid box, and adapted the pattern from a Vietnamese temple window. The box also gave me an excuse to use my new assortment of rare earth magnets, which are amazingly powerful. To avoid cutting the tiny decorative circles, I used slices of 1/4" walnut dowel.
The new box book has a chapter on making boxes with pivot lids. The ones in the book use a slightly different construction that does not involve magnets, but the basic principles are the same. I would avoid magnets on boxes for children, because of the potential swallowing hazard if one ever came loose (unlikely, but possible).
These boxes are easy to make, and easy to customize or vary, and I think should be good crafts fair sellers.