Check this out, someone at redmondpie created iPad theme for iPhone and iPod, pretty awesome.

You will need to have a jailbroken iPhone to get it all to work. Follow the instructions posted here to first jailbreak your iPhone if you haven't already and then download and install the following in this order.

* Winterboard app via Cydia
* "Simple iPad Theme" via Cydia
* MakeItMine app via Cydia to Change the Carrier logo to iPad. More details here.
* Shrink app via Cydia to reduce the size of all the icons on the springboard.
* ProSwitcher via Cydia for Multitasking. More details here.
* NYTimes - The New York Times app for iPhone via App Store
* Classics - The iBooks lookalike app for iPhone via App Store
* Kindle for iPhone via App Store

All the details can be found at redmondpie.com