This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
step tile–this filter takes your photo and tiles it mathmatically in a step tile
1-2-4-8-16-32 etc by selecting the number on the slider you are actually selecting the math if you selected 3 for instance you would end up with a combo of
1-2-4 instead of 1-2-3
it allows you to do this in all 4 directions
this adds a 90% offset to the blend and a threshold control to adjust the bland placement
thanks ubber
for your great filters one of wich flex tileing uber edition is the bassis for this one
tile step ubber math pyramid