CollageMo - Easily create beautiful real life wall collages
Trigraphy - Photo editing app that allows you to make mosaic/abstract looking art.
A Color Story - The photo app to colourize your life
GIF Brewery by Gfycat - Create stunning GIFs from videos & screen recording for free
Shrub - Draw with your camera.
WidsMob Montage - Make stunning mosaic photos or montage shape with tiles, which supports both JPEG and PNG files.