Just weighing in, almost 3 years after the original request, in order to keep this feature request at top-of-mind for the Articulate folks.
I love having the ability to change the background color of my trainings in Rise, as it gives each training a slight, subtly different feel.
But having to go through and update each individual block every single time is such a pain. It seems like it should be easy enough to have a global default for a course that can be set to something other than white, and then people can change individual block backgrounds as it works now.
Basically, instead of hard-coding the default background as #FFFFFF, just have a field in the settings section that allows us to change that. If you really want to get fancy, include a radio button option for "Apply to all blocks now" and "Apply only to new blocks going forward". This way people could build different sections of their training with different background colors if they wanted, very easily.
Thanks!