Photomosaics with the single-tile-image method.
Use the formula here (bar for window 3) rather than the one on the worksheet.

BEGIN FORMULA BARS
1#|#Subject#|#(64,64)#|#*,*,#|#@server:tanimoto:mona-rgb.jpg#|#c#|#A nifty design#|#100,100
2#|#Tile#|#(16,16)#|#1,*,#|#@server:tanimoto:mona-rgb.jpg#|#c#|#A simple transformation#|#250,100
3#|#Photomosaic#|#(1024,1024)#|#1,2#|#s1(x/16, y/16) * (s2(x mod w2, y mod h2)-32)/95#|#c#|#A nifty design#|#400,100