How to change the crosshair color in Unreal Tournament 3

Open UTWeapon.ini from:

x:\Documents and Settings\USERNAME\My Documents\My Games\Unreal Tournament 3\UTGame\Config

First section in that file is:

[UTGame.UTWeapon]

Locate: CrosshairColor=

These are simple RGB values, so now open an image editor like photoshop and use the color picker tool to setup the color you want, then get the RGB values from there and enter them into the CrosshairColor variable.

For example, this is pink:

CrosshairColor=(R=255,G=0,B=255,A=255)

Save the ini file and try it out.