I found this app which allows you to take two photo and merge into one with cool effects like Galaxy S4. It supports both main camera and rear camera if you have it.It might be interesting for some of you.
Download link : Amicus Dual Shot | Windows Phone Apps+Games Store (भारत)
Source : [Other] - Amicus Dual Shot - Chu
Download link : Amicus Dual Shot | Windows Phone Apps+Games Store (भारत)
Source : [Other] - Amicus Dual Shot - Chu