Google Column chart works in both Reports and Dashboards and is easy to use. With conditional traffic light visualization, you have the possibility to control the column colors based on a preset value range which adds a new dimension of visualization with the added colors red, yellow and green. You control the settings and set your own threshold - red (lowest) and yellow (middle). You can also freely alter both title and width of the columns to better suit your needs.
For more information or to download and use this custom visualization, see Customized Google Column Chart.