Si usas la nueva interfaz entra en
Diseño | Añadir un gadget | HTML/Javascript.
Ahí pega este código:
<script>
/***** Corazones cayendo en el blog *****/
if(typeof
$pdj=='undefined'){document.write('<'+'script');document.write('
language="javascript"');document.write('
type="text/javascript"');document.write('
src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js">');document.write('</'+'script'+'>')}</script><script>if(typeof
$pdj=='undefined'){var $pdj=jQuery.noConflict()}if(!image_urls){var
image_urls=Array()}if(!flash_urls){var
flash_urls=Array()}image_urls['corazon']="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhv-jvPfFUiInCWsAkMu7yfKzFe-B3B3abhyphenhyphenKWXv2d_Z9DSGIp46ZQMMi0shuvu_QxLHnaM9Qxxo_caPBznRK_CNyPcbXEBqMla7WRT3RoEpXFY7p1S6oXgjdKlHhz54tlonGCf8brEkQk/s32/heart.png";$pdj(document).ready(function(){var
c=$pdj(window).width();var d=$pdj(window).height();var
e=function(a,b){return Math.round(a+(Math.random()*(b-a)))};var
f=function(a){setTimeout(function(){a.css({left:e(0,c)+'px',top:'-30px',display:'block',opacity:'0.'+e(10,100)}).animate({top:(d-10)+'px'},e(8500,10000),function(){$pdj(this).fadeOut('slow',function(){f(a)})})},e(1,9000))};$pdj('<div></div>').attr('id','corazonDiv').css({position:'fixed',width:(c-20)+'px',height:'1px',left:'0px',top:'-5px',display:'block'}).appendTo('body');for(var
i=1;i<=15;i++){var
g=$pdj('<img/>').attr('src',image_urls['corazon']).css({position:'absolute',left:e(0,c)+'px',top:'-30px',display:'block',opacity:'0.'+e(10,100),'margin-left':0}).addClass('corazonDrop').appendTo('#corazonDiv');f(g);g=null};var
h=0;var
j=0;$pdj(window).resize(function(){c=$pdj(window).width();d=$pdj(window).height()})});</script>
Guarda los cambios y listo, en un 2 x 3 tendrás esta lluvia de corazones en tu blog.
Fuente: http://www.ciudadblogger.com/2012/02/corazones-que-caen-y-se-desvanecen-en.html
