The following code shows how to stack different sized images keeping their size.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.9.1.js'></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
</head><!--from w w w . j a v a 2s . c o m-->
<body>
<div class="container">
<div class="row">
<div class="col-xs-3">
<a href="#" class="thumbnail"> <img
src="http://placehold.it/400x200" />
</a>
</div>
<div class="col-xs-3">
<a href="#" class="thumbnail"> <img
src="http://placehold.it/300x150" />
</a>
</div>
<div class="col-xs-3">
<a href="#" class="thumbnail"> <img
src="http://placehold.it/400x200" />
</a>
</div>
<div class="col-xs-3">
<a href="#" class="thumbnail"> <img
src="http://placehold.it/400x200" />
</a>
</div>
<div class="col-xs-3">
<a href="#" class="thumbnail"> <img
src="http://placehold.it/400x200" />
</a>
</div>
<div class="col-xs-3">
<a href="#" class="thumbnail"> <img
src="http://placehold.it/300x150" />
</a>
</div>
<div class="col-xs-3">
<a href="#" class="thumbnail"> <img
src="http://placehold.it/300x150" />
</a>
</div>
<div class="col-xs-3">
<a href="#" class="thumbnail"> <img
src="http://placehold.it/300x150" />
</a>
</div>
</div>
</div>
<!-- Post Info -->
<div
style='position: fixed; bottom: 0; left: 0; background: lightgray; width: 100%;'>
About this SO Post <a
href='http://stackoverflow.com/q/23837562/1366033'>Stack
different sized images keeping their size</a><br />
<div>
</body>
</html>