Ok, it wouldn't be very creative to just copy Cafepress, but their business model of printing your pics on all sorts of merchandise for your own, or other's, delectation would work well here in the UK. I must have placed half a dozen orders with Cafepress over the last 2 years and I've probably spent the same again on the US Postal Service to get the goods to me. There are imitation sites in the US such as Threadless but whoever does this in the UK will make a fortune.
There you go... free advice.
Tags: technology, Internet, website, business, Cafepress, Threadless, UK, merchandise, printer