Blue to signify Skyactiv, IMO looks better than gray or black dull plastic on almost all other cars.
I agree, as long as the car is blue. If you're driving anything else (especially red), it looks like you pulled the engine out of a blue car at a junk yard. It reminds me of seeing a car painted at some bad shop, and when you pop the hood you instantly see what the old color was, because they were too lazy to paint the engine compartment.
Ha... when I had my IS350, I don't think I ever opened the hood. It's also the last time that I ever lease a vehicle.
You could always cover it with a vinyl carbon fiber pattern. On my Mica gray, the blue looks rediculous when I open the hood.