Coono breathes live into your notifications by colorizing them with the dominant color of the notifications’ icon. This feature expands over banners, Lockscreen notifications and the headers in the NotificationCenter, preconfigured to bring you the best aesthetics.
The tweak comes with its own dedicated preference pane in Settings.app where you can fine tune the colors for yourself by adjusting transparency and saturation. A bunch of options for the Lockscreen background behind the notifications are in the package as well, like removing blur, changing the tinting and other adjustments.
Coono is available for $1.5 on Cydia Store via BigBoss repo