Valparaiso was an amazingly colorful city. There is loads of street art (graffiti), and most is actually art! One of my favorites was down a set of stairs near our hostel.
Other aspects of color were in the mundane aspects of life. This is the address for a hostel in Valpo, colorfully done to represent the city and its luminance.
Valpo also has strong character that if shown without color has an antiquated feel. This black and white storefront was a favorite of mine.
Finally, my love of sepia served me well at a cafe near where we were staying. The picture has a relaxed feel to it which I believe comes from the two wine glasses on the table.