We’ve implemented the ability for end users to change the background image, chosen by a set of pre-defined images.Jasper Oosterveld (O365 MVP) commented
Agree! We are now able to pick a selection of cover photo's (awesome) but most companies would like to enforce a corporate branding here.
4,668 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.