i did them in photoshop. draw 1 of those lines with path tool, make a selection, fill with white, make it 2 pixel wide. then just copy that line over and over, but each time you copy, you move it down once, und left (or right) once.
Nice!! It really feels like its a lot of depth in this. And i agree with you on the format, cant tell you how much i love those kind of formates when it comes to photo, and design in general. Also love the lines!. good work..