If its cement, you
may, as sir Levi said, embed it inside your walls, ceiling or floor using flexible pvc hose.
I learned from the carpenter & mason during construction:
"Mas madali i-retoke ang semento kesa sa kahoy."
I know medyo mahirap na babakbakin mo pa walls mo, but if you want the wires invisible & neat, this is one of the ways to go.
Another is, as sir Levi said (para akong sirang plaka
) stuff it in your cornice, baseboard, etc..