i got my intj boyfriend a whole bunch of funny stuff. a whole bunch of hilariously stupid toys including:
a jesus bobble-head (ironic as he's borderline athiest)
fortune cookie band-aids that had messages on them (that was dumb, lucky numbers: 3, 4, 17)
a cookie cutter shaped like a fetus (HA)
he laughed his ass off. to him i think it was thoughtful, whilst not being smothering. i also made him some almond toffee, which i think he really appreciated
on his birthday i put a cake i decorated inside a box, complete with forks, candles, plates, napkins, candy and a lighter. it was a little party in a box and i rigged it so that when he opened it music would start playing and a balloon would come out. i think he enjoyed the cleverness and again he laughed his ass off. it's funny how someone so outwardly cold could lighten up so quick.
these worked for me!! feel free to use them but beware: you might just end up with an intj.. aah!