The company I work for has a kudos system. You can give any gift, but in practice everyone gives $25 amazon gift cards since they are almost cash. Employees are encouraged to give at least one a month to someone who deserves it. I haven't been through a performance review yet, but I wouldn't be surprised if they are taken into consideration.

From my experience it works amazingly well. It's silly, but if you are ever having self-doubt, a gift card from a coworker really helps.