I came across this great product on Everything Under the Sun. It's from a company called Photo Shower Curtains and it makes personalised shower or bath curtains. They will print up a full size curtain with your own photo which is washable and non fade in 2 to 4 weeks. Prices at the moment are $220 for the bathtub size and $150 for shower stall size with free delivery within the USA.
They will export internationally if you let them know when placing your order to arrange a delivery price, and they will accept payment through Google Checkout or Paypal. Check them out if you fancy something a bit different for your bathroom.