GIMP Plugin Registry

Lomo-Gimp tries to give your digital pictures the warmth of those taken by an old rangefinder analog camera. Think of it as a Kodak Instamatic or a Lomo Holga faking effect. It enhances contrast and saturation, and applies a light and a dark overlay, trying to emulate incorrectness in exposition. Please note this does nothing to emulate the chromatic aberration peculiar in pictures taken using a real Lomo.

Get it at Lomo-Gimp.

This script simulates the Lomo effect.
Copy it into the scripts folder from GIMP, you will find it then under Filters -> Light and Shadow -> Lomo.  read more »