The 3G iPhone doesn’t come with a dock , unlike the 2G version, instead you have to spend an extra $29 on an Apple iPhone 3G Dock.
So we decided to make our own iPhone dock, that was easy for anyone to make and can be made from readily available materials.
We decided to make our dock out of cardboard, and wanted anyone to be able to print one off on their printer so we kept the size to A4.
Geeky Gadgets has a pdf pattern and a video tutorial. This will give you a place to put your iPhone as you recharge it with vegetables. Link -Thanks, Roland!