Here are some styles to style the output items from ListWidgets and from filtered transclusions. In TW it is simple enough to wrap a whole list for styling as a unit, but not so trivial to target the actual items.
Here are the styles:
Note that the styles apply to every item in the list. It is possible to target individual items in a list by adding, for example, the nth-child() selector. See some CSS reference for more on this (eg).
There's also a method to get a conditional list header here:
Mat von TWaddle <:-)