Calle Caminito ( which is in the La Boca District of BA) is a sort of "Arts Fair " area. The houses are usually made from metal sheeting and are brightly painted like Valparaiso, often with unsual shapes and angles etc.
Especially on weekends, the street are packed with artists and street performers etc
You will find some great little paintings, metal figurines made from all sorts of unusual stuff at unbelievably low prices. If you need to buy any sort of gifts etc this is the place to go.
Its somewhat comparable to Los Dominicos in Santiago.
mike