1. iPhone 4G running on iPhone OS 4.0

Now that multitasking will be supported in
iPhone OS 4.0, Anthony De Rosa decided to add a 5 Megapixel camera, larger and brighter screen, and a front and back camera. You can view a gallery of all the screenshots at Anthony De Rosa’s website
here.
2. Transparent iPhone 4G

Wouldn’t it truly be magical if you could have a transparent iPhone 4G? I know it is possible since this type of technology was demoed in CES. [Via
Concept Phones]
3. iPhone 4G Pro
The iPhone 4G Pro has a front-facing camera, slide out keyboard, and 5 MP camera with 3x optical zoom. [Via
Gizmodo, original design by
Mat]
4. iPhone .02 concept

The iPhone .02 supports 4G or maybe even 5G. Toss garbage in to the incinerator of this iPhone and it converts it in to energy. The iPhone .02 also allows you to communicate visually using the front facing camera. [Via
Carl]
5. iPhone 4G with physical slide out keyboard

The iPhone pictured in this image has a click-wheel just like on the old iPod Classic and a physical keyboard. [via
UberGizmo]
6. iPhone 4G Deluxe

Pictured above is the iPhone 4G Deluxe. An iPhone with a glowing purple
Apple logo on the back, and a purple futuristic home button on the front, and a front-facing camera. [via HD]
7. iPhone 4G Deluxe with Gamepad

Games are the most popular apps on the iPhone, and it would be convenient for iPhone gamers if Apple were to add a slide-out keyboard with Gamepad keys. [via HD]
8. iPhone 4G Nano

The iPhone you see in this image is a thin & small iPhone, or the “iPhone Nano”. [Credit: Isamu Samoa]
9. iPhone 4G iMac Edition

An iMac styled iPhone with a front camera on the top and aluminum finish around the home button on the bottom. [via HD]
10. iPhone 4G Concept

12 Megapixels camera, Micro SD Card Reader, LED Light Indicator, Solid Metal Projector, Two speakers, Two Microphones, Multifunctional Home Button, and removable battery. [via Phone Concepts]
11. iPhone 4G Aluminum edition
This is a unibody iPhone with an aluminum casing. Read the details for more info. Looks cool, but aluminum would interfere with the cellphone interception so the aluminum part of this concept will never happen. [Credit: Jim Young]
Via
quickpwn