Hi everyone

This may be of interest to some and as the title says it's about multiple grid position background colouring, I could not find any reference to this in the documentation though that doesn't mean it isn't there or mentioned, but there certainly isn't any examples that show this, so here is a method I discovered that does the trick.

n = 15; a = Partition[RandomSample[Range[n^2]], n];
coordinatelist = 
 Partition[RandomChoice[Range[n], 2 RandomInteger[n^2]], 2]; Grid[a, 
 Frame -> All, ItemSize -> Full, Spacings -> {1, 1}, 
 Background -> {Pink, Automatic, 
   Table[i -> Green, {i, coordinatelist}]}]

Of course the coordinate list in this example is a random list, it would of course be whatever list you wanted.

Paul.