On my second ForeUI project, the application’s landing page was designed to be a dashboard with a few simple charts. I faked that by importing and scaling some PNG images of charts, but it would have been a lot more convenient to have basic bar, line, and pie chart elements available to drag into place.
Both Balsamiq Mockups and FlairBuilder provide simple chart elements, and surely you don’t want them to have an edge on the feature count. 😉