Another member asked Tan this question recently and unfortunately there's no plans for another calendar project. It literally took months of work and as it was a very small professional print run the costs involved were incredibly high, which possibly meant that the calendar didn't sell as well as anticipated due to the high purchase price - think they were £15 each to incorporate a donation to rescue.
There was a large amount which went unsold which in turn meant that less profit was raised for the chosen rescue. That is the aim of any Purrs project/fundraiser, to raise as much as possible for the rescue and the cats they care for, so unfortunately the calendars just aren't viable.
You can order personalised calendars from places like Tesco online
http://www.tescophoto.com/calendars Maybe your special boys could have a calendar all to themselves