Comrades here is January and we are almost back to campus ,let's check on this hustle, Selling of Flowers And Customized Greeting Cards As a campus student, this is one of the best business opportunities you can try out. Celebrating birthdays on campus is a cherished tradition. This means that there will always be a ready market for customized greeting cards. On seasons like Valentines, cards and flowers are always in high demand. Doing business during this time will earn you good money.