This is a rather simple concept, but it was enough of a "ah-ha" moment for me that I decided to give it its own post. If you have a mesh with many faces (or verts or edges) and you want to randomly select them, this is how.
For this example we'll start with a sapling tree.
To randomly select different leaves (faces) on the tree, while in Edit Mode [TAB], under Select, choose Random. (Note that there are many other options here).
As expected, this will randomly select faces within the mesh (tree).
From here I can assign separate colors (materials) to the randomly selected leaves to generate a autumn colored tree.
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