A free app for Android, by Cheer Up Studio.

If you want to create an amazing collage using your own stock of photos, you should definitely download Grid Frame Collage. The software allows you to combine multiple photos into one cool artwork. You can modify certain elements like colors, and even replace the border with a background image. 

The app comes with a bunch of overlays that sprinkle a bit of sparkle and mystique into your piece. 

To begin a project, you simply select a frame. Next, add the photos you want to combine into the collage. Customize it with text and a couple of stickers. Finally, you can save the collage and share it with your friends.