Quoting AA (Noname)
A change in textures- some grey wave-y pieces, grill bricks, or tiles connected to headlight bricks. I think I already talked about that before.
All right, point taken. I can see usisng the headlight brick with a tile, or the log piece, but to me the grill bricks don't resemble stone in the slightest. In this particular MOC, I wouldn't have wanted to use the headlight bricks due to the gaping hole that they'd leave on one side of the wall. So I guess that leaves the wavy log pieces, which I have around two of. I guess next time I use BL I'll consider buying some.