Maybe this will stimullate some discussion . . .
I like doing creative interpretations like these.
The flag iris is a nice print in its own right without a photo mosaic. (You can see it on my home page temporarily --
http://www.thelightsrightstudio.com). The rose is a useful example for tutorials but, let's face it, it is rather trite. There's nothing fresh in yet another picture of an emerging rose blossom. The photo mosaic is fresh, especially when the cells are images of flower postage stamps.
I am not a fan of Princess Diana, being too much of a left-wing Laborite for such medieval pomp. But there are a gazillion Princess Diana stamps. So, I am working on a Princess Diana image from an oil portrait that uses Princess Diana postage stamps for the cells. I expect it will be quite popular (IOW, marketable).
Getting the various images for the cells is very tedious. The more you have, the better. Especially if you do not allow Mosaic Creator to colorize your images. But, who said art was without tediousness?!
Cheers,
Mitch