Use the Template Picker screen to pick a collage template that fits your preference.
Add images to your collage. Tap with one finger to browse your albums, or tap with two fingers to quickly get to your photo Moments.
Drag or pinch images to crop them.
Should you feel like one of the images is not to your liking, you can always long press to reset your choice.
Use one of the provided images as the background of your collage.
Select the color picker to set a solid color as the background.
Slide to set the Hue, Brightness and Saturation of your preferred background color. Hit "Save Color" to use it.