A tough one. It is on QuincyMarket, not the centre building but one of the shops which are circled around. It is a gift shop, they have some fun student stuff, funny lamps and a large collection of clocks... from modern design clocks (metal) to handmade colorful wooden ones with animals and trees. And if I am not mistaken you can enter from Quincy market (the circular street surrounding Faneuil Hall) but there is also an entrance from inside a covered place shared with other shops.
Anyone an idea which shop I am talking about?