Additional Portfolios in the Frontpage

Hi, I have created 12 Portfolios and I would like to make them all visible in the frontpage of the website (http://fotons.eu). When accessing to Customizing -> Theme Options -> Portfolio I can mark 12 in the "Number of items to show", but it only displays up to 9. Is it possible to display these 12 Portfolios in the frontpage? Thank you very much for your kind help. Best regards, Santiago.