I liked the binarius theme, but it wasn't blue enough for me
I also added some custom menu functions to go with the new CourseFlow course format (see https://moodle.org/mod/forum/discuss.php?d=221919) which bypassed the scroll of death by putting activities right in the students face (rather than via URLs)
Extra custom menu functions can be useful - I took the example for display all courses and added "display my courses" so a student can see directly what they are enrolled in, and also added some navigation so the user can step through section by section (or activity by activity if you use Courseflow format)
Feel free to have a test - any feedback much appreciated. I would put on git if I knew how - I will try to figure that out this week. In the meantime, it is here as a zip.