Here is something that i have been recently working on. Was inspired by an old version of this on a windows based software system that was designed to show total sales of a shop or chain of shops right from one desktop platform. We are now taking a similar platform mobile! This design is in its early stages, so not sure if the final product will have it integrated!
The one star would give you a sad face, two would give you a semi smile and three stars would give you a really good smile. Its a stand alone widget that i can use in a lot of my projects if its not put into this one!