From laughingsquid.com:
Artist Diane Meyer adds pixelated sections to her photographs by embroidering pixel-like squares directly on to the photos with a needle and thread. The embroidered areas obscure the underlying photo, much like digital pixelation is used to obscure portions of a photo or video. She has used the technique on photos from her past in the series “Time Spent That Might Otherwise Be Forgotten,” and on photos of Cold War relics in Berlin in “Berlin.”
via Faith is Torment