Boover is a tweak that lets you change the notification-badges in iOS. You can read more about it here. This tweak is open sourced and it can be found here.

It is capable of changing things like position, size, opacity, color and shape of the badges. It can even dynamically change the color based on the application it is for.

It features an intuitive positioning-interface that has since been copied by similar software. You can see it in the screenshot below.

screenshot screenshot screenshot