Lay out a design of sea shells. You may choose a focal point for the centre, and create a symmetrical pattern, repeating the pattern on each side.
Hot glue the sea shells the head band, starting in the middle and working your way out, with the large shells first, and then filling in with smaller shells and faux pearls. Take care that nothing is poking downward, and that the crown will balance and not fall off your head when it's finished.
Optional: Finish off with some faux gemstones and glitter for a more sparkly look.