Lot of games could have custom crosshairs, but First Person Shooters almost require them!
Here's my custom crosshair system for Half-Life 2
http://www.moddb.com/mods/elements-of-war/videos/custom-crosshair
1. Crosshair is as large as the screen
2. Multi-Colored
3. Weapon based
4. Team based
5. Camera system based
6. Crosshair ONLY HUD option
7. Playing or watching a demo based
8. You name it, players want it!
// Curtis Turner <IceIYIaN>
// Creator of Elements of War!
// http://www.ElementsofWar.NET
// http://www.ModDB.com/Mods/Elements-of-War