Depends. If you were to keep the Aveo5 (and as is), then the GT in chrome wouldn't look bad. But, if you are going to remove the Aveo5, then definitely avoid the chrome. That Aveo5 all by itself in chrome looks weird. IDK what color you should go with though... I'm just leaving everything on the back alone, except for the LT, mainly the L if I can find a G in the same size as the rest. If I can't, then I'll just order both the G and the T. Although, I think the GT would look better if it was bigger.
As for the one inside, I just realized that I'll have to change the color, as chrome in direct sunlight on a rather bright day would suck so much when driving. Maybe color match it, or just paint it black, to differentiate from the emblem work and the interior. Like I said, I'll just wait until I do the back first. Only thing is that it's hard for me to motivate myself to do most of the stuff that I want to do. Well, most of it costs at least $100 or more. I guess the freebie/cheap stuff can be done first.