"When we unveiled Gmail's new look back in November, we introduced a number of new, beautiful HD themes," explained Google's Greg Bullock. "We also heard that many of you wanted to bring an even more personal touch by setting your own background."
As a result, the search giant this week announced the arrival of custom themes, which will allow users to upload their photo or graphic to use as a background image one of two light or dark custom themes. Users can upload their own images directly, via Google+ or an image URL, or browse Google's catalogue of Featured Photos to find one they like.
Source: Toms Hardware