How to change box/minipage text color?

[Nikos Chantziaras]

I'm trying to figure out how to have boxes (inserted with 
"Insert->Box->Shaded Background") have a specific background color and 
text color.  I was able to figure out the background color part.  For 
example, for black I've put this into the preamble:

  \definecolor{shadecolor}{rgb}{0,0,0}
But I can't figure out how to change the text color.