Pixlr

The app comes with various filters, overlays and effects that you can combine and create unique pictures to share with friends. It also has a tool for creating collages using multiple layouts, backgrounds, templates, frames and many more. You can blend pictures together and use style features for removing blemish or red-eyes.
 
In addition, you can add text bubbles and various stickers to images to make them stand out. Aside from this, the app comes with tools for adjusting borders, resizing pictures, cropping sections or balancing out colors. You can also focus the image on one color by using Color Slash or transform your photo and make it look like a pencil drawing or an ink sketch.