Edit in JSFiddle

.boxes{
    display: inline-block;
    vertical-align: bottom; /* try bottom or top */
}
.box1{width:150px;height:100px;background-color:red}
.box2{width:130px;height:200px;background-color:blue}
.box3{width:170px;height:190px;background-color:yellow}
.box4{width:200px;height:200px;background-color:purple}
.box5{width:100px;height:100px;background-color:green}

<div class="box1 boxes"></div>
<div class="box2 boxes"></div>
<div class="box3 boxes"></div>
<div class="box4 boxes"></div>
<div class="box5 boxes"></div>