Hence, I created the following reward system. Yes, it is slightly complicated. Yes, it takes a bit of effort... BUT my students love it. Feel free to use this in your classes. Please note I am presently in an all girls school, hence the female titles. However, you could easily adapt or change them for an all boys or co-ed setting. You could also create a similar system for other subjects based on the best in your field.
I use Etsy to source the award badges. They have become a much sort after object in my school!