if i ever go to Japan (I have a friend over there); this is my list of things to bring back (bear in mind that this is in my case, I'm a guy):
FOR ME:
A full kimono set, including the kimono, haori (jacket), hakama (pants), a pair of tabi (socks), a pair of geta (sandals). the full outfit.
FOR FAMILY/FRIENDS:
A miniature geisha figurine; a friend of mine has 4 of them, including two dressed in wedding kimonos.
A Kabuki mask
a couple of bottles of real Japanese Sake (rice or plum).
Lanterns
A rice paper parchment with a Japanese verse, written in Kanji using the Sumi-e method of drawing.
If you ever go and travel, i strongly suggest you visit the Akihabara District; is the technological mecca, where you'll find thousands of electronic stores and fin stuff that you will never find in the US in terms of high tech devices.
My advice, go with plenty of money, you will thank me later. :)