George,

Just have the icons you want to use in a folder you can find. In Depiction, you replace the icon for a single element in the Element information window (get there by double clicking the element or through the Manage content window). Or for a set (group) of elements, select them in the manage content window. You then select "Set icon" and click "browse" (the third option). Navigate to your folder of icons and select the one you want to use. When you click apply, the icon(s) in your Depiction will change.

I hope that helps.
Happy Depicting!
George
Depiction Support