NyanSliders is a mobilesubstrate tweak i released some time ago, that replaces all your boring sliders with fancy animated Nyan cat sliders leaving rainbow trails !
Works on common UISliders as well as MPVolumeSliders and MPDetailSliders.
You can enable/disable animation and rainbow trail via Settings.app.
The current version is 0.0.1-7 (update that enables nyan cat animation while sliding).
You can get it here: http://dl.dropbox.com/u/36225110/com.dummydev.nyansliders_0.0.1-7_iphoneos-arm.deb and install it manually or find it at BigBoss Cydia repo.
Also here is a poster i created for the lulz :P
Hope you enjoy !