OK, this will sound like the world's biggest smartass answer...but how about looking at an adult toy shop?

I seem to recall a kit out for molding a phallus of your John Thomas...you know, for when you're away and the Missus misses the little Mister. Despite the original purpose, it seems to me that a rubbery material like that could be molded to the shape of your hand.

Oh geez...I just thought about what that could connote.

I'd provide a link, but I'll leave that particular bit of googling up to your discretion.

EDIT: OK, this may be an option not requiring a discreet brown paper wrapper...or answering embarrassing questions about your grips "fleshtone" coloring.