ENFJ- something with which they can express themselves even more! (my sis's favorite present was a sewing machine with which she could modify her clothing, my ENFJ ex was delighted with a camera...)... or a mind control ray, I do beleive that they'd LOVE one of those
ISFJ- something that you've put thought into. If it shows that you took some actual interest in them and what they need they'll be pleased.
ENFP- the one I know best was quite pleased to receive a slightly offbeat present that related to his interests and showed that I knew something about him
INTP- yes, anything that feeds thier latest interests