GC comes with a demo template pack and few themes for it. You can create your very own customized templates but the default templates can work as a starting point or inspiration.
SmartPX Graphics Controller "GC" is a browser-based controller/client for managing and controlling graphics template playout on CasparCG server(s) and/or live streaming applications such as OBS, vMIX, or Wirecast.
Overview: https://www.youtube.com/watch?v=0jHSkSPf1cw
Download for free from https://spxgc.com
Available for Windows, macOS, and Linux.