This tweak allows you to remove gutters from some columns in Bootstrap 2 while leaving margins on other columns intact. (To remove gutters from all columns, just change the column and gutter variables in variables.less).

grid-no-gutter.less

@import "mixins.less";
@import "variables.less";

.grid-no-gutter {
  /* Removes margin from Bootstrap Grid. This class goes at least one level above row-fluid.
  Works in Bootstrap 2. In Bootstrap 3, #grid has been removed. */
  #grid > .fluid( percentage( 1 / @gridColumns ), 0 );
}