So basically i got this by messing with the crop feature on Paint 3D to get a 6x6 pixel canvas, then i randomly put black, grey, and white dots on the canvas. I decided to save it as a sticker, and got this smoothly blurred version of the canvas.
When I switched to a LARGER 1:1 canvas (precisely 360x360 pixels) I inserted the sticker and got specifically the blurred noise. I randomly colored things black with the paint bucket tool (paint bucket fills anything in a region of similar colors with the selected color), then I saved THAT as a sticker.
I put the sticker into the canvas, set the transparency to 50%, and flipped it 180 degrees, and put it on the original sticker. I once again filled random parts with black using the paint bucket, and saved it as a sticker. I put a 50% transparent version of the sticker on the original sticker, then placed it slightly offset. That is the image you're seeing right now.