A free app for Android, by PhotoCorner.

This is a photo editing app which provides different types of effects. The app lets you choose from various images and convert them into mosaics. You can edit the background and make it colorful or gray.

You can choose to change the opacity of the tiles, as well as the size of the tiles and the distance between them. The app lets you choose from a wide range of backgrounds, including the option to choose from your own images. You can change the color of the tiles and the background.

The app lets you create mosaics from any collection of photos. You can add more than one photo to a mosaic, and you can change the opacity of each photo.