This tutorial explains how to make patterns that will repeat seamlessly in Illustrator. It shows how to use single and multiple images.

Here is a complete guide to creating customized repeating patterns in GIMP and then adding and using them from the Patterns library.

Photoshop CC tutorial showing how to create a tessellation pattern from scratch. Tessellations are repeating patterns ...

Creating tiled patterns for seamless designs is a technique used to ensure that an image or pattern can be repeated endlessly without any visible seams or abrupt transitions.