Bootstrap 3 offset on right not left

Bootstrap rows always contain their floats and create new lines. You don't need to worry about filling blank columns, just make sure they don't add up to more than 12.

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">

<div class="container">
  <div class="row">
    <div class="col-xs-3 col-xs-offset-9">
      I'm a right column of 3
    </div>
  </div>
  <div class="row">
    <div class="col-xs-3">
      I'm a left column of 3
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-body">
      And I'm some content below both columns
    </div>
  </div>
</div>

I'm using the following simple custom CSS I wrote to achieve this.

.col-xs-offset-right-12 {
  margin-right: 100%;
}
.col-xs-offset-right-11 {
  margin-right: 91.66666667%;
}
.col-xs-offset-right-10 {
  margin-right: 83.33333333%;
}
.col-xs-offset-right-9 {
  margin-right: 75%;
}
.col-xs-offset-right-8 {
  margin-right: 66.66666667%;
}
.col-xs-offset-right-7 {
  margin-right: 58.33333333%;
}
.col-xs-offset-right-6 {
  margin-right: 50%;
}
.col-xs-offset-right-5 {
  margin-right: 41.66666667%;
}
.col-xs-offset-right-4 {
  margin-right: 33.33333333%;
}
.col-xs-offset-right-3 {
  margin-right: 25%;
}
.col-xs-offset-right-2 {
  margin-right: 16.66666667%;
}
.col-xs-offset-right-1 {
  margin-right: 8.33333333%;
}
.col-xs-offset-right-0 {
  margin-right: 0;
}
@media (min-width: 768px) {
  .col-sm-offset-right-12 {
    margin-right: 100%;
  }
  .col-sm-offset-right-11 {
    margin-right: 91.66666667%;
  }
  .col-sm-offset-right-10 {
    margin-right: 83.33333333%;
  }
  .col-sm-offset-right-9 {
    margin-right: 75%;
  }
  .col-sm-offset-right-8 {
    margin-right: 66.66666667%;
  }
  .col-sm-offset-right-7 {
    margin-right: 58.33333333%;
  }
  .col-sm-offset-right-6 {
    margin-right: 50%;
  }
  .col-sm-offset-right-5 {
    margin-right: 41.66666667%;
  }
  .col-sm-offset-right-4 {
    margin-right: 33.33333333%;
  }
  .col-sm-offset-right-3 {
    margin-right: 25%;
  }
  .col-sm-offset-right-2 {
    margin-right: 16.66666667%;
  }
  .col-sm-offset-right-1 {
    margin-right: 8.33333333%;
  }
  .col-sm-offset-right-0 {
    margin-right: 0;
  }
}
@media (min-width: 992px) {
  .col-md-offset-right-12 {
    margin-right: 100%;
  }
  .col-md-offset-right-11 {
    margin-right: 91.66666667%;
  }
  .col-md-offset-right-10 {
    margin-right: 83.33333333%;
  }
  .col-md-offset-right-9 {
    margin-right: 75%;
  }
  .col-md-offset-right-8 {
    margin-right: 66.66666667%;
  }
  .col-md-offset-right-7 {
    margin-right: 58.33333333%;
  }
  .col-md-offset-right-6 {
    margin-right: 50%;
  }
  .col-md-offset-right-5 {
    margin-right: 41.66666667%;
  }
  .col-md-offset-right-4 {
    margin-right: 33.33333333%;
  }
  .col-md-offset-right-3 {
    margin-right: 25%;
  }
  .col-md-offset-right-2 {
    margin-right: 16.66666667%;
  }
  .col-md-offset-right-1 {
    margin-right: 8.33333333%;
  }
  .col-md-offset-right-0 {
    margin-right: 0;
  }
}
@media (min-width: 1200px) {
  .col-lg-offset-right-12 {
    margin-right: 100%;
  }
  .col-lg-offset-right-11 {
    margin-right: 91.66666667%;
  }
  .col-lg-offset-right-10 {
    margin-right: 83.33333333%;
  }
  .col-lg-offset-right-9 {
    margin-right: 75%;
  }
  .col-lg-offset-right-8 {
    margin-right: 66.66666667%;
  }
  .col-lg-offset-right-7 {
    margin-right: 58.33333333%;
  }
  .col-lg-offset-right-6 {
    margin-right: 50%;
  }
  .col-lg-offset-right-5 {
    margin-right: 41.66666667%;
  }
  .col-lg-offset-right-4 {
    margin-right: 33.33333333%;
  }
  .col-lg-offset-right-3 {
    margin-right: 25%;
  }
  .col-lg-offset-right-2 {
    margin-right: 16.66666667%;
  }
  .col-lg-offset-right-1 {
    margin-right: 8.33333333%;
  }
  .col-lg-offset-right-0 {
    margin-right: 0;
  }
}

I modified Bootstrap SASS (v3.3.5) based on Rukshan's answer

Add this in the end of the calc-grid-column mixin in mixins/_grid-framework.scss, right below the $type == offset if condition.

@if ($type == offset-right) {
      .col-#{$class}-offset-right-#{$index} {
          margin-right: percentage(($index / $grid-columns));
      }
  }

Modify the make-grid mixin in mixins/_grid-framework.scss to generate the offset-right classes.

// Create grid for specific class
@mixin make-grid($class) {
  @include float-grid-columns($class);
  @include loop-grid-columns($grid-columns, $class, width);
  @include loop-grid-columns($grid-columns, $class, pull);
  @include loop-grid-columns($grid-columns, $class, push);
  @include loop-grid-columns($grid-columns, $class, offset);
  @include loop-grid-columns($grid-columns, $class, offset-right);
}

You can then use the classes like col-sm-offset-right-2 and col-md-offset-right-1

<div class="row">
<div class="col-md-10 col-md-pull-2">
col-md-10 col-md-pull-2
</div>
<div class="col-md-10 col-md-pull-2">
col-md-10 col-md-pull-2
</div>
</div>