The iPhone 4, especially the iPhone 4S has a great camera on it. This latest accessory by Photojojo (they make awesome iPhone camera accessories) gives your iPhone a classic camera style.
Here’s part of the product description:
The iPhone Rangefinder is a phoneography system that gives your iPhone all the style of a classic camera. It’ll equip your phone with a shutter button, viewfinder, aperture numbers, two loops for a camera strap, and a tripod mount!
Furthermore, it’s compatible with their magnetic cell cases, which give you effects like Fisheye and Wide Angle shows.
Take a look at it here.