Some background on this question:
In S05E04, "The Time of Angels", a looped recording of an angel locks eyes with Amy and enters her mind in such a way that she thinks she is turning into stone. Additionally, the following phrase is repeated multiple times:
That which holds the image of an angel becomes itself an angel.
Fast forward to S06E11, "The God Complex". Gibbis' worst fear are weeping angels, and are clearly manifested in the room with them:
Could these "images of angels" have done harm to anyone had they lingered in the room?