Disabled appearance after upvote

It looks like the upvote feature in the list block now has the ability to prevent multiple upvotes per user, which is great (unless the user deletes cookies). I’d like to see (whether through a feature change or some CSS) it’s possible to style the disabled upvote boxes (the ones where a user has already voted) in a way that makes them look disabled. The ones where a user has not voted would maintain their styles.