Light Flow is the kind of app that best showcases Android's sensibilities: esoteric, amazingly customizable, and downright impossible on other platforms. The popular notification manager for devices with LED indicator lights has just had a big update to version 3.8, most notably bringing support for the popular NinjaSMS texting app. NinjaSMS users, make sure you're running the latest version of both apps, and enable Light Flow in the settings menu.
Other changes to Light Flow include a tweaked notification system, in which persistent notifications are more, well, persistent. Devices running older versions of Android will have to do without persistent notifications, for reasons which the developer does not list.