I'm certainly not a photographer nor a skilled graphics designer. However, it looks to me like it started off as a photo of someone posing nude in a seated position, the discoloration on the corners were probably fingers in front of the lens... Based on the resolution, how the image appears to be replicated on the left and right, and the fingers on the corner; I'd say it was probably taken by a smart phone.
The image looks as if it started off as a tall, half-width photo. It was probably ran through some noise and blur filters, adjustments were made to the levels, a brush was used to place those darker "splatter" dots on the image, and finally it was duplicated, flipped horizontally, lined up side-by-side, and had the sides blended together.
But as lanotdesign said, you won't be able to replicate it exactly. You could probably achieve something similar though.
And there are many ways to use that in your Photoshop files. Since it doesn't have nicely blended edges, you may not wish to use it as a pattern. However, you can still load the image into Photoshop, place it over a layer, change its blending mode, and use Alt + Ctrl + G to set the layer beneath it as a clipping mask.
(Note: If Alt + Ctrl + G doesn't work, you can access it by using the menus Layer > Create Clipping Mask)
you are reading way too much into that. it's clearly mirrored, but that's about it. i can see what you're talking about if i look for it, but the fact that i have to look for it and it isn't instant suggests you're looking too much into it. i was able to recreate something pretty similar in about 5 minutes:
1. pick an arbitrary background colour: purple
2. make an oval of another arbitrary colour (pink) - gaussian blurr it by 50px or so
3. if you're feeling particularly artsy, grab the smudge tool and mess it up so it isn't so uniform.
4. mess with some colour overlays - i added a light blue via gradient overlay
5. make some lighting layers - low opacity black, brushe arbitrarily. set to overlay.
6. repeat step 5, brush arbitrarily, gives realistic lighting, play with blending modes.
7. add clouds filter / then difference clouds filter. set to overlay, low opacity, i used 10%
8. copy merged, double canvas, paste, flip horizontally - infinite repeat pattern
the main thing to focus on here is it isn't even a texture. it's a fe things in play:
-overlay lighting layers
- noise layer
- grunge brushes
- the clouds / smudge tool will give it a non-uniform feeling.
see the result:
obviously not identical, but it's not supposed to be, it's just supposed to show each piece at work.