Mosaic isn't unique in the Store, but it's new and caught my eye. The idea of reconstructing an existing photograph made of tiny versions of existing photos is clever, if ultimately pointless in the same way as much modern art. Does it actually work? Only after a fashion, but as the developer says, it does depend hugely on how wide your range of source material is.

From the Store description:

Mosaic is a beautiful, fast and easy to use image mosaic app. Select an image and the app will mosaic the image based on a random selection of images in your picture hub. The more images you have and the more diverse they are, the better the result.

I took Mosaic for a whirl and tried re-creating a shot of me on holiday last year:

Mosaic starts off with some suggested photos that you might like to re-create, but tapping on the library icon lets you choose anything from your local on-phone folders. And yes, I've blurred out faces here, for the usual reasons; (right) this is the image I plumped for - down on the beach at Minehead, UK, at dusk...

Mosaic - surprisingly (and somewhat suspiciously) quickly - compiles the image from fragments of others - I presume it's working from thumbnails, accounting for speed. There's the option to leave photos as-is (left) or 'adjust hues' (right), the latter creating a smoother mosaic at the expense of altering the colouration of the original photos (as if it mattered!)

Options to save at three different resolutions - I opted for high and then zoomed in a little in the main 'Saved pictures' gallery in Windows Phone. Ooh, look, there are my other photos, in miniature!

Ultimately, Mosaic is a one tricky pony though, and the results aren't that spectacular. Maybe my source material (only 30 or 40 photos, this being a newly reset phone) was the issue here, or maybe the point of the exercise is rather lost on a photo purist like myself. Comments welcome - does this work better for you?

Mosaic is a free download in the Windows Phone Store.