Please let us know if you have more theme ideas. Keep voting and commenting!
An error occurred while saving the commentZachary Morris-Dean commented
I'm thinking along the lines of Gmail's themes, where they can fill the screen on full message view.
4,793 votesworking on it · AdminBarbara Feldon (Office 365 Customer Experience, Microsoft Office 365) responded
Great news! This capability is included in in the recently updated Office 365 Roadmap entry: “Admin App Launcher Customization Tools” which can be found in the “In Development” section.