Well, I think you Paint the bumpers in Gray color, like the shade below :-
Matching White bumpers won't be something new in Pakistan. Most people do that.
Plus, I think you should remove the Black rubbers ( like on Door sides, Fuel Lid, etc )if you plan to go with a Colored bumper.
Black rubber/plastic parts, like Door handles and Side view mirror might be matched with the Car color.
For Rims, it's upto you. I am not sure if those stock Rims will look gud if matched with the Bumper color .