Crippled is a fallout pip-boy themed battery widget that displays your battery percentage and a vault boy that changes his look as your battery drains/charges. Comes in 3 colors, green, amber and blue.
When you install this, it won't be in your apps list, it will be in your widget list.
Wallpapers shown are part of the Pip-Tec theme:
Green:
https://play.google.com/store/apps/details?id=com.natewren.piptecgreen
↓ 49