Like any art experience with preschoolers, it is the process that is important rather than the end product.
When young children first start to play with clay they are discovering "what does clay do?" before they move onto "what can I make with clay?" They poke it, squeeze it, pinch it and pound it.
Natural materials like twigs and seeds become another tool they can use in these explorations.
You might also enjoy:
::: Telling Stories with Clay and Dough
::: Another Week, Another Bushwalk
What have you been doing with clay lately?