When it comes to the use of apps, I try to keep it simple, using apps that allow me to do what I want to do (a la Photoshop) instead of an app imposing its filters on me (I've never used Instagram). Most apps do the same things quite well but for a long time, the only two apps I've used were Photoshop Express and Be Funky. Everything and anything that I wanted to do, I could perform with these two.
Enter Snapseed. I like it overall but its implementation of their framing device is particularly effective.
BTW, all three apps are FREE.