There some excellent places in Addis to do souvenir shopping that is not just the usual white natelas etc. and that also follow the rules of Fair trade so you are doing a good deed aswell.
Sabahar (in Mekanisa close to Salem nurses college) are the first place that uses silk for scarves, wonderful designs, rather pricey, but still worth it, www.sabahar.com
Muya Ethiopia(Siddist kilo, close to Egypt embassy and Entoto training college) this is the first place in Ethiopia that became member of IFAT http://www.muyaethiopia.com/
Negist Ethopia (in Old Airport Area) phone number 011 372 8080
All three are part of the design africa project that you can check out here http://www.designafrica.ca/designafrica