4
You'll have to edit your templates to change the look of those blocks.
Administration>System Admin>Templates
Then clone the default set, you can't edit the original default set.
Once your template set has been cloned, select System (List) from the cloned template set. The templates can then be edited to suit your requirements.
Don't forget to select the cloned template set in your preferences menu, or your changes won't show.
*edit* Beat me to it, WarDick :P