I recieved an interesting question via e-mail that I thought I'd share. it demonstrates just how much modding can aid this world of ours.
"I am writing to you because I need help changing the color of the blood in Halo 2. Our Church just invested $50,000 in videogame equipment to allow teenagers a place they can hang out and be in a safe environment. We are OK with the war shooter games but the blood upsets some people. I want to know if there is a way to hack the game to stop the blood or change the color. If so would you please tell me or direct me in the right direction."
this was my response...
unless you're talking about PC's, you're probably going to run into some trouble getting approval for modding. although it is possible to buy pre-modded Xboxs with third-party warrantees, modding Xboxs means voiding the Microsoft warranty. if you have PCs then you won't have to worry about any hardware modding and Halo 2 mods are supported.
once you have modded systems, changing the blood to another colour (or even transparent) would be an option.
for questions about modding an Xbox, go to http://www.xbox-scene.com
for questions about modding Halo, the place to go is http://www.halomods.com