Cyanogenmod stopped being blue
The colours aren't the only difference. Your second screenshot also has a dark background to each shortcut's label, and a different graphic for the tray at the bottom. The combination of graphical changes to the launcher, changes to SystemUI, and different-coloured icons for system apps like the browser, makes me say the second screenshot is of a different version of Cyanogenmod, or a different ROM completely.

Could you or someone else have flashed a new ROM onto your phone? If you're not sure, go into the Settings app, click About device and read the version information on that screen.