I don't know about the ones sold at shipwreck shops but a frequent visitor to St Martin takes beautiful photos & has them put into calendars,mugs etc. The calendars are more than the shipwreck ones but all proceeds go to "all about a smile" . Jeff Jhangiani (sp? ) from D K Gems is involved with helping these children.
Take a look at
www.createphotocalendars.com/shop/collectingpreciousmemories The photographer is Heather Crisostomo . I have one & it is beautiful. I think it's an orphanage. Last year proceeds went to help the lady with stray animals.