Replying your question, ElectricBlue. The set is created by me gathering high resolution nice plain textures (had to cut from different unorthodox images) and taking small elements, such as screws, metal elements, plus the HAL9000 eye from Space Odyssey movie and photoshopping it all in a detailed way for 2 full working days.
This is not a drawn set. I intended it to be as high in graphics as possible. So I used the method that game designers use - apply photos and rendered images in 3d.
the bottom line - No, you cant find any of these textures per se in the internet lying around asking to be picked up, but Yes all these images are shot/rendered by others and are in free use.
The result ingame is absolutely amazing.
P.S. Had I taken these photos myself or rendered the images, the starting bit would be 100k with raises of 10k. But the result would be the same ingame.