I'd enjoy just more plain doors.
I have a front door with absolutely no window.
I have a sliding door that seperates two rooms.
I have no pics, but I'll try to diagram it just in case.
Below is door
__________
||<--Wall
||<Indent in wall
||
__________|
--------> door slides into a slot in the wall for the person to walk through.
None other I can think of right now. But I like all the ideas you have up there.