Spectral is different from BlurredMusicApp, which simply blurs the Music App's borders and controls depending on the color of the album artwork (Spectral only applies to the lock screen).
Give the iOS 7 lockscreen a little more character with blurred album artwork!
Configure options from Settings app.
Developers can take a look at the source code here
You can download Spectral for Free from Cydia in the BigBoss Repo.