SUMMARY: Not quite Wordless Wednesday.Inspired by Johann the Dog's Valentines Day photo mosaic, I downloaded the app they recommended, AndreaMosaic (versions available for windows & mac. Can be very slow to run. Must have patience).
Fed it the 6000-+ photos in one of my photos folders, then gave it a photo of Tika (this one that I used recently) to reconstruct as a mosaic using my photos.
(I didn't attempt to weed out oddball ones, as you'll find when you notice that it used many copies of my photos of a curtain-rod bracket, a couple of cartoons, and a USDAA accumulator sheet to fill in the white and light gray areas. Someday I might build a different database of photos that are just dog-related and try building photos from that. I just suspect that the color scheme will be a bit limited--mostly gray, white, and green. :-) )
You can click it to see a larger version and some of the detailed photos within it, or download the full-sized version.