I'd be careful of the team name/logo thing. Team colors? Sure! But most teams guard their trademarks with a vengeance - and rightly so as it represents a ton of profit. Now you could market them to the teams themselves, but you would be paying them, not the other way around. Not sure if your profit margins would stand up to the royalties. Better to stick with colors and avoid the whole mess. BTW - have you searched the patent office for similar "inventions"? Unless you have it covered, anyone could knock it off easily. Hell, they can do that anyway and the burden is on you to hire an attorney and prove that the idea is yours.
As for the product itself, it's at least a way to personalize your grill, and after all, how many other ways are there to do that? Agree with some of the comments that the function may or may not be your best selling point.
Marty