"Everyone can paint" used to be the name of a Dutch toy set when I was a child.
With really basic drawing skills it is possible to make useful "iconic" charts. The umbrella below was used to highlight how a strategy has shielded one of my clients from the full effect of the 2008 economic meltdown.
Look at shapes and see how they are decomposed in very simple elements: a few ellipses and some rectangles. On the right I gave them a different color to make them visible. Make sure that everything is neatly spaced out and symmetrical. The background image was purchased on iStockPhoto.
The key lesson: simple drawings do not have to look simplistic.

If you liked this post, why not subscribe to daily updates about presentation design via email? Just blog posts, no spam, or you can follow Jan on Twitter to never miss a thing.