Themes are nothing new for avid Gmail users -- after all, they've been around in some form or fashion since 2008. But starting today, Google's adding a personal twist. You know, personalization. We're told that a new Custom Themes section will be hitting inboxes the world over during "the next couple of days," with Light and Dark options there for your customizing pleasure. You can upload your own images directly, select from your Google+ photos or simply paste any image URL. Can't decide? Just cycle through the Featured Photos list instead of whittling down that Priority Inbox. Hea
