Which hand do you hold it in?
The curve sweeps around the corner your thumb pivots on, so the whole
home page mirrors.
Your avatar
The drawn one is a stand-in. "One you've built" lists the avatars
from your set and puts the one you pick in the circle — the same list the app uses.
Headings
A photograph of the thing each column opens, with the name in the corner.
Plain keeps the icon and the small line underneath.
Colors
One color per half. More looks to choose from are still to come.