* Make tracks
Tracks in the mud! If it is a muddy day outside, take a bunch of toy cars and other vehicles outside and make tracks directly in the mud. If it’s not muddy, you can make your own mud indoors by missing up brown paint with water to create a muddy consistency. Pour some onto a plate and dip your vehicles in, then race the vehicles across a piece of paper to create muddy tracks.
... from "A Rainbow of Colors", Earth*School, copyright 2005-2009