I have a ListBox bound to a list of Items (for arguement, lets say its got a string and two dates Entered and Done).

I would like to make the background color of items in the ListBox have a gray color if the Done DateTime is != DateTime.MinValue.

Edit:

Should I make a converter? and convert DateTime to a Brush based on the value of the DateTime?

Is something like this my best option? or is there a simple Xaml snippet I could use?

[ValueConversion(typeof(DateTime), typeof(Brush))]
class MyConverter : IValueConverter
{
    ...
}