I realy need a little help with :checked Selector

I realy need a little help with :checked Selector

Hi, I use this code http://api.jquery.com/checked-selector/ for show checked fields... But I now need to result be in numbers of squares.. For example if you check 3 checkboxes you will get in result bellow 3 squares..I think to resolve squares with ul li elements, but to to this with jquery I have no idea how :) Can you please help me?