These are a few simulations in which Maya Plug-ins such as Xgen, and maya simulators such as the fluid simulator and the particle simulators were used.

This first video uses an Xgen expression with a hair system attached in order to create semi-realistic grass blowing in the wind.

This next video includes both Xgen and Maya fluids in order to create turbulent clouds.

And finally, the last video is a particle simulation which includes two Newton Fields and a Volume Axis in order to give a sense of movement.