ScreenshotSaver for Nook Simple Touch

takes a screenshot every 1:50 to use as a screensaver.

After launching ScreenshotSaver for the first time, go to the device's settings and change the screensaver to ScreenshotSaver. To stop ScreenshotSaver from running, launch it again.

To avoid the weird color bug of the Nook's /system/bin/screenshot program, ScreenshotSaver ships and uses the fb2png program instead, from https://code.google.com/p/android-fb2png/