For the Weekly Stars (as Biff described below)~ you can use this to reinforce following a "tough" rule. For instance, we use our Weekly Stars for how long we go without breaking Rule #2 (Raise your hand for permission to speak). In the beginning we see "how long we can go". Each time we break our record we earn a star. Once we get up to 20 minutes (usually this happens within the first few days of school), we just use a timer and cap the time off at 20 minutes. EAch time the timer goes off and we haven't broken Rule #2 (or whatever rule you are working on), they get a star. If they shout out (break rule #2) we reset the timer. 20 stars and on Friday we get a class reward. In kinder~ we get to go on the "big kids" playground. In third grade, I let the students have centers. (the funny part was that the centers was work we were going to do that day anyway, i just themed it: reading/ writing/ art/ computers/ etc and had it in different parts of the room. Students rotated with their table group to each of the "centers". Since students pretty much stop doing centers at our school in K, possibly first, they thought this was very cool:). The best part was when they didn't win, I still had them do the same work, just at their desks, independently! I also made it that students who did not finish their homework did not get to rotate and had to finish their homework and whatever work at whatever center they missed because they were catching up on their homework. If they could get caught up, they could join the groups:)
If you want to tie in the scoreboard game with the "Weekly stars"~ you could give a star each time students have more smilies than saddys when they go out to recess. Then they just accumulate them until they reach the goal and get the award. I've heard of awards such as: an extra recess, being allowed to choose their own seats for the day, pick their own groups for an activity, etc.
For daily rewards we do longer/shorter/regular recess~ but you can also do minutes of PAT time (preferred activity time~ you'd be surprised how hard students will work to be able to have 2 minutes of time to choose what they want to do, within your pre-disclosed boundaries), or even play the awesome game of "Mind Soccer" (check out WBT website for details)
Hope this helps:)