Okay, I have some Reach models, with diffuse textures on them. I don't care about bump or that atm, but I'm having some trouble making them not white. For example, I have a spartan model that I don't want to be white , I want them to have primary colors and secondary colors just like Halo Reach. Any help would be appreciated.

Take a regular "Standard" material.
Click the box where you add a bitmap, and select "Composite"
Add another layer or 2 in the composite
Add the diffuse in the bitmap slot.
Add a mask in the mask slot.
On the left of the bitmap slot there is colour correction, click that.
Select the colour you want.
There is another setting that i cant remember its name, somewhere under where you added the colour, it may be called power or something.

Thank you so much. This is perfect.