When cropping out pictures, we usually produce square and rectangular images. But, if you use the InstaShape app by Zicolor inc, you can easily crop out pictures in various shapes. The app contains a selection of shapes to crop your pictures. You can use circles, triangles, rectangles, oblongs, and even hexagons. You can also apply two or more separate crop shapes on the picture. The app also lets you save the edited picture on your device, and share your picture to Facebook or Instagram.
The app is $0.99 and can be downloaded here from Windows Phone Store.