IMosaic

Way way back in 2004 I played with a photo-mosaicing application called Mazaika.  Back then I only had about 11000 photos.

But in the past week or two I've been doing a photomosaic jigsaw of Kit's, and it's rekindled my interest in photomosaics.

I had a look on the weekend for apps to try, and gave IMosaic a go.  It's quite old - no new releases since 2006, it's pretty slow, and it squishes vertical photos down to landscape mode, but it is free and does have the ability to index different directories independently, rather than as one massive index.  

So I indexed all my last holiday photos (6687 photos), and used them to create a photomosaic of the Queen Mary 2 (image from Wikpedia).

Here's some closeups of some areas

Fun times!!