Adobe Spark Post is a free card maker that allows you to create something truly memorable for a loved one. Choose from a selection of sizes, design options and backgrounds to make a greeting card that definitely won’t be found in stores. Whether you’re creating a card for a birthday, wedding, anniversary, or a new baby's arrival, you can easily send a heartfelt message that will never be replicated.

I don't know if it's just the Avery software of what but these do not print the way that you see them on screen. It's incredibly frustrating when something is centered and there should be no problem with it printing centered on both the front and back but the cards end up overlapping and you can't print doubled sided because they just don't print right. I never have this type of problem when I print regular index cards or word/pdf documents so I'm going with its an Avery software glitch but as long as you print one-sided they're OK.
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. 
Emailed, hand-delivered, or posted with a stamp, greeting cards are timeless expressions of thoughtfulness. Images and texts capture your message and speak for you in a personalized, custom greeting from our extensive gallery of selections. Every card is both printable and available to share online via email, Facebook or whatsapp and our Card Maker walks you through the simple process of using our template, step by step. Celebrate a birthday, congratulate an anniversary, express your thanks, say you’re sorry, or send caring thoughts for any holiday or occasion on the calendar from your computer, phone, or tablet. You’ll find designs and styles for every taste, and it’s easy to edit the text or write your own, add photos, and embellish with sticker images that match the mood of your card.
The presentation of the cards—the packaging—helps make a successful handmade card business. A card that is neatly presented in a cellophane envelope looks more professional and can command a higher price than one that is unpackaged. Presenting cards in some form of packaging stops cards from becoming dirty or dog-eared and it also gives the ideal opportunity for further marketing. A label on the back with your phone number or website address could help you solicit further orders. Remember to consider shipping and packaging when factoring the costs per unit in your pricing formula.
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