A photo of windows formed the basis of this Liquib Droste rendering.  The window panes in the center were flanked by columns, and that area was made transparent by using the GIMP graphics program.  The Droste Tool was then applied with the Droste Style set to Winding Boxes.  Another variation appears below.
Liquib Winding Window Droste
The Convolvate Droste Style was applied to the same windows photo to produce this roughly symmetrical image of window frames descending into oblivion.  Where does each level begin and end?
Liquib Convolvated Window Droste