Created by the company of the same name, the Modu phone resembles a small MP3 player, with a screen the size of a postage stamp and very basic controls. It's so small that it's in Guinness World Records as the world's lightest cell phone.

But the folks at Modu (the company) hope that you won't buy just the phone itself. When the device ships this spring, it will be accompanied on the market by four "jackets"--skin-like shells that you can drop the phone into to change its whole look and feel, including the screen. The looks consist of the Modu Classic (a slider phone with a large screen), the Modu Night (which adds a camera to the device), the Modu base unit, the Modu Express (which gives the phone a colorful, whimsical look), and the Modu Street-Art (a candy-bar handset with a large screen).

Modu's possibilities seem endless: On display at the company's hospitality tent were prototypes for a music phone (with JBL speakers), a bike phone, a phone with a car mount, and a phone on an armband for joggers.