<div class="container-fluid">
  <div class="row">
    <div class="col-lg-12">
      <div class="rect green">1</div>
      <div class="rect green">2</div>
      <div class="rect blue">5</div>
      <div class="rect blue"></div>
      <div class="rect blue"></div>
      <div class="rect orange">11</div>
      <div class="rect orange"></div>
      <div class="rect green">3</div>
      <div class="rect green">4</div>
      <div class="rect blue"></div>
      <div class="rect blue"></div>
      <div class="rect blue"></div>
      <div class="rect orange"></div>
      <div class="rect orange"></div>
    </div>
  </div>
</div>

.rect {
  background: green;
  width:200px;
  height:200px;
  float:left;
  margin-right:10px;
  margin-top:5px;
  color:white;
  font-size:3em;
}

.green {
  background:green;
}

.blue {
  background:blue;
}

.orange {
  background:orange;
}