A.F.
I tell you what my favorite gifts were when I went away to college...
1. a tool kit- I was the hit of the dorm- no other girls had a hammer, screwdriver etc...(that's what you get when your dad is a contractor)
2. Gift cards for Pizza, meijer or Walmart
3. Gas Cards
4. Phone cards- although most kids have cell phones these days- anything to help with the bills comes very handy!!!!
5. Jewelry would be nice too, every girl like Jewelry- I would recommend that from your son to his girfriend more so than you...it's so much nicer getting it from your boyfriend!
For your niece- money is always a good idea, school is expensive and all the cash you can get helps! Maybe a gift certificate for a new outfit for that first week of school.
I hope this helps!
A.