I call it the pixel tyedye bug, happened in the Outcast Anchorage DLC Base, thought it was pretty funny and wanted to share it.
You should really clip/scale your images - that was HUGE, yet only even half of it was actually part of the picture.
Anywho, it reminds me of the ground in Windhelm. There are certain textures in the Beth games that are so low-res that especially on hi-res systems/monitors really look BAD! You'll find a number of texture replacers that target Windhelm because of that.
When I reloaded the game the bug went a way, but I thought it was amusing. Reminded me of missingo in the original pokemon games.
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