I went back to OS6 today, because I was able to create my own theme without the trays. This is nothing fancy, but I think it's clean.
Hidden today, 6 icons on the bottom, and weather slot (7th icon on app screen). I don't have it set up to navigate to Today items on home screen (you need to go into menu).
I added underlayment on the app screen, tweaked the phone screens, and the homescreen banner. Again, nothing crazy here. Just trying to build a simple, clean theme, that let's me see my wallpaper, and quickly get work done.
I thought I'd share. Of course TB6 Beta has some bugs, but it just limited what I was able to do or move around. I haven't found a true bug in my theme yet, except for perhaps a spacing issue in the network indicator that TB won't let me fix yet.