How about a DIY seashell display case? You could buy a simple wooden shadowbox and paint it a coastal theme. Then your friend could use it to display some of their favorite seashells. You could also add some craft sand, small starfish or other sea-life for an extra touch. If you like to splurge, you could also find a nice seashell collectors' book. This book will guide your friend through their seaside adventures by providing a space for them to record memories, observations, and collected items like beach glass, pebbles, and of course, seashells.
Or you can get her/him a star map with the date when she/he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.