That's similar to Teal and Orange fad: <a href="http://theabyssgazes.blogspot.com/2010/03/teal-and-orange-hollywood-please-stop.html" rel="nofollow">http://theabyssgazes.blogspot.com/2010/03/teal-and-orange-ho...</a><p>I think the blurring could be avoided. This effect is usually achieved by changing the color balance (whites -> off-white, darks -> bluish) - seems a bit hard to do with IM: <a href="http://www.imagemagick.org/Usage/color_mods/#non-linear" rel="nofollow">http://www.imagemagick.org/Usage/color_mods/#non-linear</a>
A web app would be, I think, popular. Especially if you build in some kind of "easy to use with phone" features, and some "social, but in a better way than all the other drek that's around" stuff.