4 neon lights

what would it look like if u had 4 neon lights of different colors? would they just blend in together or would they have their own seperate colored area?

it would depend on the size of the case, 4neons would cost a lot, us a lot of watts, and be quite bright. If you want different colors, stick with 1 or 2 neons (or even better: cold cathodes) and use LEDs to illuminate certain feature of your rig.