Alright, so, not really many changes but I think it looks different enough. I've got the first two Vile's for comparison. I also think DW hit the nail on the head with the crimson color. It just works.
Row 1: X1 Vile, X3 Vile, and Vile Limited
Row 2: Just different colors I tried. The first is based of Jango Fett (lol), the second is Yllisos' suggestion, and the third is just an alternate to the crimson pallette
Row 3: MegaMissions does this weird thing with its busters on a lot of characters where it puts this crystal dome over the front of the buster. I just applied it to Vile's cannon
Row 4: Same thing applies here. I figured I'd give Vile more weaponry since he is a war machine and the buster replaces the original arm cannon with the same function as his MHX arm weapon. Basically, its a rapid fire buster coming from two spots (the two "domes" are seperate barrells). The crimson one is just me messing with its look again as the MegaMissions series seems to have a knack for giving a character a buster that doesn't at all match the rest of their body
(See EX Armor Zero from MegaMissions 2)
I'm liking the crimson look best, but I'm not sure which buster to use. Hmm.. Also, I guess I need to make a Limited Ride Armor.