Heart battery icon morph turns current battery icon into a heart, charging battery into a pumping heart. Right now for light colored notification bars only, future version will include for dark colored bars and possible size adjustment as the heart looks big compared to other system icons. Just waiting for my battery to run down before I make these adjustments to see the full range of icon set in action.

Grab it at XDA here: http://forum.xda-developers.com/showthread.php?t=764792