Thanks for the compliments, I think it'll look great on any color to be honest but to me it looks extra good on black because it blends well.
Yeah, GLA comes with a plastic bracket for the plates that has to be drilled through the bumper. I didn't want that and I didn't like the tow-hitch plate attachment (not to mention many has experienced sensor errors with it's placement).
Not exactly custom, I just found a way to put the plates on the grill. I made a thread on it a few months back:
http://www.glaowners.com/forum/merc...on/10337-lower-grill-licence-plate-mount.html
Beware though, the mount I used migh/will rust so try and protect it. You can spray it with rustoleum or even plastidip to protect it, especially if you're in a location that rains once in a while.