There is a variety of sample graphs that you can use as a starting point for your own effects, or study to learn more about Bifrost.
To load a sample graph in Maya, choose Windows > Bifrost Browser.

If you do not see the proper result of the graph in your scene, make sure that Playback speed is set to Play every frame in Maya's Time Slider preferences.
You can see information about the graph in the Info panel, when no node is selected at the top level of the graph.

You can publish your own graphs and share them with others. Your published graphs also appear in the Bifrost Browser. See Publish effects as graphs.