I think a rap theme by itself is a bad idea but I would love to see rap/hip hop featured as a soundtrack for a pin.
I think the perfect theme would be the video game Grand Theft Auto. You could select your radio station before the start and have either a rap or rock music choice. The game would have tons of action, violence, and car chases and would just be over the top fun! Rockstar games could essentially use the pin as billboard advertising for GTA6 whenever that comes. GTA6 is supposed to return to Vice City so it could be more focused on 80s era music but they could base it off 5 and do modern as well.