As an iPhone owner, I think you should take the time to jailbreak and play around with the new options this gives you.  One of these options is the ability to add themes and as you saw earlier, new lockscreen layouts.  These pictures will show an application called LockInfo, which is one of the most popular jailbreak apps.  The second picture shows something called GridLock, which gives you the ability to move icons where ever you want, hence in a grid fashion.