When people Jailbreak, not everyone wants to install big flashy themes or significantly alter how their iPhone, iPod Touch or iPad functions. Some people prefer the subtle approach to Jailbreaking and install tweaks that give them a couple of new features and that is it. I myself would tend to put myself into that category.
If this sounds like you then you might want to check out the FullScreen Album Art Cydia tweak. What this tweak does is makes your album artwork display fullscreen on the lockscreen. Simply install FullScreen Album Art, respring, start playing a tune and lock your device. Upon waking it again you will notice the album artwork has been stretched to take up the entire lockscreen.
After playing around with the tweak I can definitely conclude it works as advertised. Not all album artwork looks great stretched fullscreen, but I must admit it changes the style of the lockscreen completely. I suggest you check the tweak out and decide for yourself whether you like it or not.
You can find it in the ModMyi repo for free and it has no settings to configure. Be sure to let us know what you think of the tweak in the comments section below.