Figure 16.111.  The same image, before and after applying glass tile effect.
You can find this filter through Filters → Glass effects → Glass Tile
After applying this filter, the active layer or selection is rendered as through a glass brick wall.
Figure 16.112.  “Glass Tile” filter options
Parameter setting results are interactively displayed in preview. Scroll bars allow you to move around the image.
Tile width: Sets tile width (10-50 pixels).
Tile length: Sets tile length (10-50 pixels).