I think it's great that you're trying new things Willace
I have to agree with Fitz that if I saw someone in an Uncle Sam suit with a green beard I'd either think he was trying to make a statement (green beard means the government should go green, maybe?) or think the guy wearing it must not care about the image he's projecting. Now if you really did want to make a statement that's fine too, but I don't think people would look at you and think "Uncle Sam crossed with a clown!", unless they already knew you.
Maybe Willace wearing an Uncle Sam beard would work though. He's already got a natty hat annd cane, so it would look very dapper and old fashioned, I think. And you wouldn't have to color your beard.