For those looking for an effective and memorable way to keep in contact with current and past clients, there are a variety of postcard templates to choose from. Easily customize each with your own text, colors, fonts and images.
You can learn to design printables with free options like Canva, or Paint. These programs are fine for basic designs, but can be very limiting. If you would like completely custom designs, programs like Adobe Photoshop and Illustrator are excellent.