We have started a new download page for holiday themes. You can find the themes download page here
As of right now, we only have a couple holiday themes, but we will add more themes for the most popular holidays, including, Easter, Valentine’s Day, Thanksgiving, Independence Day, Memorial Day, New Year’s Eve soon.
Of course, there are quite a lot of holidays internationally, so this will be quite a task. If you would like to submit your own themes for your own international holidays you can send them to us (win8themes at googlemail(dot)com)