So, thanks to friend Steven for sending me the following link via Janice.
What interests me most about this design is that it includes the name of most, but not all, of the Inklings, plus one more who's usually not included in the group (although several Inklings scholars, such as Doug Anderson, have argued for his inclusion):
Tolkien, Lewis, Barfield, Williams, Christopher Tolkien, Warnie Lewis, Roger Lancelyn Green, Adam Fox, Hugo Dyson, Robert Havard, J. A. W. Bennett, Lord David Cecil, Nevill Coghill
I cd quibble (why 'Hugo' for Dyson but Robert rather than 'Humphrey' for Havard?), but then there's a limit to how pedantic I want to get over a t-shirt. Besides, it's an attractive design (unfortunately didn't see the artist's name anywhere); I'll probably be picking one of these up.
So, thanks to Steven and Janice for the link.