When I was just a little youngter my and my mom would go on business trips she would always bring back a little knick knack or souvineer from whatever place she went to. My favorite one was a little mini replica of the Sky Dome in Toronto when it first opened.
I thought this was a nice jesture and have continued this. I'll usually bring back a Tshirt of a local team or something and give it to a GF or my roomate.