Some background and a head's up....
Back when I got my Z06 in 2007, I found a guy on the web who made visor decals that stuck right over the warning labels already there. He used the cross flags & Z06 logos, an outline of your car (color matched to your particular color - mine was JSB) and a saying (choice of 3-4) - the one I chose went something like: "This Corvette Z06 has 505hp and is capable of a top speed of 198mph. Please buckle up, sit back, and enjoy your ride"
There was also a saying available inferring any female passenger should remove any restrictive undergarments and hand them to the driver to be safe....cute, but not for me as I was in a relationship.
Anyhow, bought them, applied them, loved them. When I got my ZR1 in 2010, I tracked him down again and inquired about new decals.
He responded that GM legal had sent him a "cease & desist" letter for using the trademarked logos - so he did similar ZR1 decals for me, but had to alter the logos so as not to infringe.
Bottom line is, if you are doing for yourself, I think you should be OK; but if you are using the logos & selling - GM will come after you...so be careful! They are *VERY* protective of their trademarks!