Turning a passion for posters into a side hustle can be a rewarding and profitable endeavor. The key to success lies in finding a unique niche, leveraging your creativity, and effectively marketing your products. If you enjoy designing posters, consider creating a collection that caters to specific interests or trends. Vintage travel posters, for example, have a timeless appeal and can attract customers who appreciate nostalgia and classic design. You can also explore other themes like movie posters, motivational quotes, abstract art, or personalized designs for special occasions.