Im not sure what I think about metalic bags, I think its because my mum used to wear those gold metalic bags and in my head they are old fashioned. I know they are in but I just couldnt buy one!
Persoanlly I love really bold coloured bags, at the moment, there are lots of orange, olve and teal bags which im totally loving!
To answer your question.. I'd say.. a denium bag. When you think about it, denium never goes out of fashion, and im sure we all have at least one denium bag somewere.
I think you need 1 black, 1 white, 1 brown and 1 denium before you get any other colour lol