Not all design choices are blatantly obvious, which is why it's helpful to see fresh sections being added to Google's official design guide for Android devs. There's a whole new chapter on how to create a good Settings pane, including what settings to make controllable or fixed and how to describe options in plain English. There are also new tips in the Navigation section, such as how to take full advantage of Android's ability to let different apps activate each other. There's no color-matching advice, unfortunately, but if you stick to black and blue you ought to be fine. Access the tips via the Google Plus link below.