To change Gmail app theme, you need to start by opening Gmail account and then proceed to settings option. You will find it in the top right-hand corner. From there, select themes from the right-hand side. After that, you will see a selection of images that you will choose as a new background. If nothing jumps out, tap to more image’s options at the bottom. Lastly, click to save and you will be able to see the inspiring new background. These are the steps that users need to follow to smoothly change Gmail app theme.