Biz Rebel - Business | Marketing on Instagram: "Cardboard Letter Business This business idea is going viral because it’s simple, visual, and profitable. A creative entrepreneur takes large hollow cardboard letters, lines the inside, fills them with chocolates and candies, and seals them with a clean, aesthetic finish. No special tools, no complex steps—just smart branding and presentation. Each piece costs only a few dollars to produce, yet she sells them for $20 with ease. The margins are huge,