Im not sure if somebody had it, but it's probably thread worthy.
Here is a full functionning gamification dashboard using copyright free icons. It contains a few custom metrics as well as a simple display on points and an image repository.
You just need to unpack the catalog file into the following BI server path : /shared/Custom/HCM/HCM Other Reports/Learning Cloud/Learning Dashboards/Self Service Dashboards
If these folders don't exist, just create them, or you'll have to change the entire directory inside reports and dashboards.
You can also use that report and imbed it into the UI through the following link (either in an iframe or in a href html tag). The link would look like the following: