Hi Anne. Those were created by Rob Ton.
I don't know what to think of them. On the one hand, it's much better than doing the colored text with CSS. If we ever decide that the colors need to be adjusted, or that no colors should be used at all, we can simply edit those few templates. But on the other hand, I see no reason to encourage people to use colors. They're not recommended for any specific purpose. They may well be recommended against at a later date. People will be upset when this happens.
Bottom line: These are not officially recommended.