I would like the ability to specify an icon for each menu item and to set a default icon for all menu items.
I was looking at my LightSwitch applications, wondering why they didn't look as good as the Windows Azure Dashboard. The basic layout of both is very similar, but I think one of the major differences is the ability to include images beside each menu item. The Azure dashboard includes many images, even if they are only simple folder icons. An icon beside the menu item would go a long way toward a more professional looking app.
Beth Massi commented
You may want to check out this sample on how to add icons to menus here: http://code.msdn.microsoft.com/silverlight/Adding-icons-to-the-01a828ff
There are also third party shells available.