If you've been to MOMA, and you liked it, then you'll love the MOMA store in SOHO. It has everything from fancy art deco to really abstract art and reasonably priced. The store is a bit small, but they still house a lot of arts and crafts inside. Some of the pieces are not conventional art, but it's still worth a look. I found a couple of good birthday presents there. Definitely recommend it. You can always just stop by for the window shopping too. Also check out the staff there, they were very helpful in offering suggestions as to what gift you're looking for, and are always more than happy help.