I think you might be looking for a story related to a dramatic event like a lightning strike, rather than a literal story about a wallpaper. However, I'll craft a narrative that captures the essence of a powerful lightning strike, set against a backdrop that could be as vivid as a high-definition wallpaper.
The wallpaper on her computer, once a simple background, now seemed to come alive with the memory of that lightning strike. The purple hues of the stormy sky, the electric charge in the air, it was all there, frozen in time. For anyone who viewed it, it would be a reminder of nature's power, a testament to the beauty and fury of the storm that had touched down on Willow Creek. 2559x1600 lightning strike HD wallpaper. Purple...
And then, it happened.