The Lime Green Skin is one of the 44 available skins in

It was one of the 9 default skins the game cycled through when playing without sharing the game on Facebook or Twitter. Now these defaults are used if a specific skin is not selected.

Default Skins

Dark Yellow | Dark Red | Indigo-Blue | Lavender-Purple | Lime Green | Magenta | Orange | Pinkish-Red | Turquoise-Cyan