This collection of spectacular lightning strikes will energise your work. They’re tileable and come in a variety of formats, including patterns, JPEG pictures, and Photoshop brushes. In this collection, there are 18 options to pick from, all of them are free.
SparkleStock is the creator of this design.
Usage: Personal and commercial use are both free.
PhotoshopTutorials offers Electrifying Lightening brushes for download.