How about a personalized vinyl record with their wedding song or a selection of their favorite hip-hop/rap songs? You could also consider buying them tickets to a concert of their favorite hip-hop/rap artist or getting them a merchandise of their favorite rapper, such as a poster or t-shirt. Another idea could be a customized photo album or scrapbook featuring pictures of them together with hip-hop/rap themed decorations.
Or you can get her/him a star map with the date of the wedding.
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.