Printable lacing cards are great for plane trips. Use shoe laces and bright motifs on laminated card, like these Pirate and Princess Lacing Cards from Busy Little Bugs. These don't need a tray so are great for takeoff or landing.
Pearls, Page 3. This is a whole collection of beautiful pierced/carved iridescent white pearls called "Bethlehem" and "Jordan" pearls. Found in the Holy Land in the 1940's and 1950's and very highly collected and treasured today for their artistry. Thanks so much to Ada Nell McComas for providing the scans of her collection!