Random Posts With Thumbnail ( simple grid )

Place this style after ]]></b:skin>
<style>
#random-posts{width:100%;background:none;}
#random-posts ul {margin: 0 !important;  padding: 0 !important;  }
#random-posts ul li {background:none ;list-style-type: none;margin:0;padding:0 !important}
#random-posts li{float:left;list-style:none;}
#random-posts img{float:left;margin-right:5px;margin-bottom:5px;border:none;width:90px;height:90px;transition:all 400ms ease-in-out;}
#random-posts img:hover {opacity:.7}

</style>


Place it on the window layout - Add a Gadget - Html/Javascipt

<div id="random-posts">
<ul>
<script type="text/javaScript">
var rdp_numposts=12;
var rdp_snippet_length=0;
var rdp_info='no';
var rdp_comment='Comment';
var rdp_disable='';
var rdp_current=[];var rdp_total_posts=0;var rdp_current=new Array(rdp_numposts);function totalposts(json){rdp_total_posts=json.feed.openSearch$totalResults.$t}document.write('<script type=\"text/javascript\" src=\"http://jokuci.blogspot.com/feeds/posts/default?alt=json-in-script&max-results=0&callback=totalposts\"><\/script>');function getvalue(){for(var i=0;i<rdp_numposts;i++){var found=false;var rndValue=get_random();for(var j=0;j<rdp_current.length;j++){if(rdp_current[j]==rndValue){found=true;break}};if(found){i--}else{rdp_current[i]=rndValue}}};function get_random(){var ranNum=1+Math.round(Math.random()*(rdp_total_posts-1));return ranNum};
</script>
<script type="text/javaScript">
function random_posts(json){a=location.href;y=a.indexOf('?m=0');for(var i=0;i<rdp_numposts;i++){var entry=json.feed.entry[i];var rdp_posttitle=entry.title.$t;if('content'in entry){var rdp_get_snippet=entry.content.$t}else{if('summary'in entry){var rdp_get_snippet=entry.summary.$t}else{var rdp_get_snippet="";}};rdp_get_snippet=rdp_get_snippet.replace(/<[^>]*>/g,"");if(rdp_get_snippet.length<rdp_snippet_length){var rdp_snippet=rdp_get_snippet}else{rdp_get_snippet=rdp_get_snippet.substring(0,rdp_snippet_length);var space=rdp_get_snippet.lastIndexOf(" ");rdp_snippet=rdp_get_snippet.substring(0,space)+"&#133;";};for(var j=0;j<entry.link.length;j++){if('thr$total'in entry){var rdp_commentsNum=entry.thr$total.$t+' '+rdp_comment}else{rdp_commentsNum=rdp_disable};if(entry.link[j].rel=='alternate'){var rdp_posturl=entry.link[j].href;if(y!=-1){rdp_posturl=rdp_posturl+'?m=0'}var rdp_postdate=entry.published.$t;if('media$thumbnail'in entry){var rdp_thumb=entry.media$thumbnail.url}else{rdp_thumb="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzbgyYUc8jydq6f5VR6c4uAuho2uQg9F6kjQBYR3tKPdHgtm2Z1ZWjB64O426Cml4je_pBMSUv1f7E8vGJ4wE60aWl9L1h965EMGP2O4l6rW4XRonjtcR-KEfLf3xM8nyGw3VAN484_ogC//"}}};document.write('
<li>');document.write('<a href="'+rdp_posturl+'" rel="nofollow" title="'+rdp_posttitle+'"><img alt="'+rdp_posttitle+'" src="'+rdp_thumb+'" title="'+rdp_posttitle+'" height="90" width="90"/></a>');if(rdp_info=='yes'){document.write('<span>'+rdp_postdate.substring(8,10)+'/'+rdp_postdate.substring(5,7)+'/'+rdp_postdate.substring(0,4)+' - '+rdp_commentsNum)+'</span>'}document.write('<div style="clear:both">
</div>
</li>
')}};getvalue();for(var i=0;i<rdp_numposts;i++){document.write('<script type=\"text/javascript\" src=\"http://jokuci.blogspot.com/feeds/posts/default?alt=json-in-script&start-index='+rdp_current[i]+'&max-results=1&callback=random_posts\"><\/script>')};
</script>
</ul>
</div>
</div>

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DEMO : Look right on this page