I made this card-in-a-box pop up card with three rows of crayons for a 24th birthday, but I think the design works better with only two rows of crayons.
I cut every crayon tip, in duplicate (front and back), from paint chips and painstakingly glued them to the crayons. This is not something I recommend.
(Did I look up which colors were in a 24 box and match them? I might have been that obsessive. Indeed I might have. The fonts are definitely matched exactly.)
Here are directions for a simplified card.
The crayons are printed, and there are only two rows of crayons.
Cut files and print files are there for download, too.
Assembly is pretty easy.
Cut out the pieces.
Construct the box strut that holds the crayon pieces, and glue it in place.
Glue the crayons to the strut.
Glue together the box.
Open it up!