There are so many blues to choose from its not even funny. Im sure there is a few hundred. I forget the name of the BMW M3 blue, but thats sweet. Viper blue & C5 vette(dark) blue is nice also. When I had my camaro(FOR SALE) repainted I used the stock color & adding some colors to it(purple, silver, black). Changing it slightly so that my car would be the only one in that color. Whne you do change the color, do it right. Paint underhood, under trunk, door jambs, trunk jambs, fuel door, behind lights, etc.
Oh wow thats a sweet car. then dude opens door or trunk & its a completely different color. Not so sweet anymore, that ruins everything!