Loved the Simple Lockscreen Slider from lemongreentea, so I made a mod for the iPhone 3GS and 3G.
Included in the download is also some extras including the lock wall from this screenshot, and two other different overlays which can be used as an alternative.
I achieved the look above by installing Clock Hide from Cydia.
Credits to lemongreentea for the original concept for the Android - [link]
For the iPhone 4 version - [link]
PLEASE NOTE: NOT COMPATIBLE WITH IOS5 SORRY.