I've got a question about cham color.

Every working cham hack i see, the color of the chams are greyish, i was wondering why are they this color all the time, and can i change it?

The Chams you are referring to are called NX chams. They are the most commonly used because they're the easiest to do. There's an actual ingame item that allows you to cham in this way so the coder for the hack pretty much just allows you to have that item always activated. Hope this helps