Making and selling handmade greeting cards provides the opportunity to simply earn a few extra dollars or to build a significant income. Most small card businesses fall halfway between these two extremes. Handmade cards remain popular and many people like to give handmade cards to mark birthdays and other special occasions. The greeting cards market is a $7.5 billion annual industry.
Keep in mind that there are already many handmade greetings cards available. To be really successful, you need to offer something a little different. In many areas, the market is swamped with handmade cards. An example of a niche is a "green" handmade card business where all products used are recycled, sustainably sourced, or some portion of proceeds benefit ecology projects around the world. When you are thinking about a niche, a great place to start is to think about the things that inspire you or make you smile.