TiltShiftGen (Version 1.0)
Art & Mobile
$1.49
When I had my iPhone, TiltShiftGen was pretty much my go-to photography app. I had SnapSneed, Instagram, LoMob, Hipstamatic, and all those other popular photo apps but TiltShiftGen provided simple adjustments with a good tilt-shift effect and the photos always came out wonderfully.
It's extremely popular on iOS but it seems like it doesn't get much recognition in the Microsoft store which is a shame. Since it's not too popular, it took me a while to realize this app was available in the MSFT store but after lots of browsing in the photo category I was happy to see it was available.