As a parent to young children, I whole-hearted support reading in the bathroom as it's often the only quality "alone" time I get, pre-bedtime. I am, however, reluctant to encourage guests to "linger" as often the number of restrooms are fewer than the number of urgent users, especially if beer is involved.
If you feel you must provide entertainment, I'd suggest nothing too engrossing. Perhaps an LCD monitor hooked up to a
Raspberry Pi, showing an endless loop of "The Far Side", "Calvin and Hobbes", or their Swedish equivalent.