grid density based on attractor points

Hi, I have a definition that randomly distributes the same brick rectangles all over a surface that then serve as punched openings.  However, I am trying to create more openings where windows are located behind this surface.  I still want the random effect, but I want the density of the openings to be greater around the window areas.  The surface that I am placing the pattern on is also a curve so I cannot use a rectangluar grid.  I want to keep the U and V points and just deal with density rather than position.  I think that I need multiple attractor points as well for each of the windows.  Woud really appreaciate any suggestions.  I am pretty new at this and am stuck right now.  This is about the third time that I have tried to upload my files but it does not seem to be working...any suggestions?

Best, 

Christian