Steps to Show Random Posts with Thumbnails in Blogger:

1- Login to your blogger account and go to the blog where you need these random posts to show up.

2- Select the blog and open layout from the left sidebar of the blogger dashboard.

3- There you need to add new widget to the sidebar which should be Html/Javascript.

4- After adding the Html/Javascript you need to grab the following code with styles attached.

<ul id='random-posts'>
<script type='text/javaScript'>
var tow_numposts=5;
var tow_snippet_length=150;
var tow_info='yes';
var tow_comment='Comments';
var tow_disable='Comments Disabled';
var tow_current=[];var tow_total_posts=0;var tow_current=new Array(tow_numposts);function totalposts(json){tow_total_posts=json.feed.openSearch$totalResults.$t}document.write('<script type=\"text/javascript\" src=\"/feeds/posts/default?alt=json-in-script&max-results=0&callback=totalposts\"><\/script>');function getvalue(){for(var i=0;i<tow_numposts;i++){var found=false;var rndValue=get_random();for(var j=0;j<tow_current.length;j++){if(tow_current[j]==rndValue){found=true;break}};if(found){i--}else{tow_current[i]=rndValue}}};function get_random(){var ranNum=1+Math.round(Math.random()*(tow_total_posts-1));return ranNum};
</script>
<script type='text/javaScript'>
function random_posts(json){for(var i=0;i<tow_numposts;i++){var entry=json.feed.entry[i];var tow_posttitle=entry.title.$t;if('content'in entry){var tow_get_snippet=entry.content.$t}else{if('summary'in entry){var tow_get_snippet=entry.summary.$t}else{var tow_get_snippet="";}};tow_get_snippet=tow_get_snippet.replace(/<[^>]*>/g,"");if(tow_get_snippet.length<tow_snippet_length){var tow_snippet=tow_get_snippet}else{tow_get_snippet=tow_get_snippet.substring(0,tow_snippet_length);var space=tow_get_snippet.lastIndexOf(" ");tow_snippet=tow_get_snippet.substring(0,space)+"…";};for(var j=0;j<entry.link.length;j++){if('thr$total'in entry){var tow_commentsNum=entry.thr$total.$t+' '+tow_comment}else{tow_commentsNum=tow_disable};if(entry.link[j].rel=='alternate'){var tow_posturl=entry.link[j].href;var tow_postdate=entry.published.$t;if('media$thumbnail'in entry){var tow_thumb=entry.media$thumbnail.url}else{tow_thumb="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghDV4UgzHWjEi86koYigCr-9QKzaqOh6Z5lsOy16glI-z2JmG_ArP1L2fMKziaNNkpbnZYHs3QSyBl6U5tLBLVQ9aod0qE34pCQI8oEruq5k2XiZjnkqq6zDFiTJJWuezVPBoILaQVhv4/s1600/default.jpg"}}};document.write('<li>');document.write('<img alt="'+tow_posttitle+'" src="'+tow_thumb+'"/>');document.write('<div><a href="'+tow_posturl+'" rel="nofollow" title="'+tow_snippet+'">'+tow_posttitle+'</a></div>');if(tow_info=='yes'){document.write('<span>'+tow_postdate.substring(8,10)+'/'+tow_postdate.substring(5,7)+'/'+tow_postdate.substring(0,4)+' - '+tow_commentsNum)+'</span>'}document.write('<div style="clear:both"></div></li>')}};getvalue();for(var i=0;i<tow_numposts;i++){document.write('<script type=\"text/javascript\" src=\"/feeds/posts/default?alt=json-in-script&start-index='+tow_current[i]+'&max-results=1&callback=random_posts\"><\/script>')};
</script>
<p><a href="http://www.talkofweb.com/show-random-posts-with-thumbnails-in-blogger" rel="nofollow" title="Talk of web Blogger Widgets">Grab this Widget</a></p>
</ul>
<style type='text/css'>
#random-posts img{float:left;margin-right:10px;border:1px solid #999;background:#FFF;width:100px;height:100px;padding:3px}
#random-posts li{margin: 0px 0px 10px 0px;}
</style>

5- Just paste this in the widget area and give widget the title of “You May Like to Read:” and click save. Re arrange the widget as per your need. If you want to increase the number of posts shown then kindly increase the number tow_numposts=5;. Simple! you are done have happy blogging 🙂