Have you read The Back of the Napkin by Dan Roam? He encourages the use of drawings to communicate both simple and complex ideas. I loved the idea and tried it out on my very visual (and reluctant) spouse. While it didn't work out exactly as I planned I think I got something across!
Maybe not pertinent, but I think male napkin diagrammers outnumber female napkin diagrammers 1000:1. Have I ever seen a woman do that? Petunia might be one of a kind. I also have seen a lot of men start drawing their diagrams when it was just T-totally unnecessary.