Here is a pretty neat looking mod from Lagg, a pack of four scopes each with its own characteristic design. It even fades out the outside of the scope, just like in real life.
Lagg's CoD2 4x Rifle Scope Pack v.1 Made by =SvS=Major Lagg 6/1/07
Here is a scope mod pack for Call of Duty 2. It contains four scope mods, each with different crosshairs. Unscoped crosshairs are unchanged.
The four crosshairs are Fire Fly, Illuminated Mil-Dot, Mil-Dot, and Plex Crosshair. Enjoy.
Put in your 'C:\Program Files\Activision\Call of Duty 2\main' folder, to uninstall just take out.