'Graded bedding'? It is one of a series of activities explaining sedimentary structures. 'Make your own graded bed - one depositional event, but with coarse to fine sediment'.
This activity can be used in any lesson dealing with the origin of sediments and the interpretation of past environments.
Lots more good ideas for ways to teach about sedimentary structures can be found on our website, either by using the search facility or the alphabetical index.