On deviantART someone uploaded a picture of a lockscreen that can be found in Cydia, which looks pretty smooth. Its called Typophone 4 and can be used on the iPod Touch and the iPhone. To use the Typophone 4 theme, you need a jailbroken iDevice, Lockscreen Clock Hide and you need to install Winterboard to activate it.
This theme IS on Cydia, people! Just search “Typophone 4″ and install, it should work for all devices (excluding iPad).