I've always loved souvenir's particularly the old "my dad went o London and all he got me was this lousy T-shirt" type stuff. Just personal enough for your dad to by, but broad enough for an oxford street shop to bother stocking.
After visiting one of these stores (which incidentally used to be William Morris's shop) I started thinking about the the logical ends you can take this stuff. How broad could a souvenir become? or how personal?
Here's the broadest offering - thanks to Marc Owens for the copy
Then on the highly personalised versions, I turned to some precarious links to my favourite artist...