A progress bar is usually used to visualize the progression of an extended computer operation, such as a download, upload, file transfer, software installation,
crisp blue against a lightly textured background
Elee Fridge App
Very "skeumorphic," or realistic-looking, toggle buttons. The "on" setting looks like it is really glowing.
Dark Picker [Freebie] by Alexander Zaytsev
Torfs UI - Free PSD | #ui
Maybe black could be a choice?