Your own images can be included in your custom label designs.
Drag and drop an "Image" element from the left-hand toolbar onto a region of the label preview.
In the right-hand toolbar that appears, click on "Upload image".
The image will be auto-scaled to fit in it's region of the label.
Super Address Labels is an application for Shopify that enables merchants to print addresses and other data from their orders onto label sheet templates made by Avery, Dymo, and other manufacturers, using a laser/inkjet or direct thermal printer.