This sort of thing could be usable if I knew how to have it tile horizontally and avoid texture stretching.

However, mariner, I thought your question had to do with placing images on the light sources, not the "wall/mortar" sections - like the lit billboards in public places.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3