Just returned (in one piece) from West Africa and immediately I've got colour withdrawals. Everything out there is so colourful that it at times becomes overwhelming for anyone that lives in a relatively monochrome city. At least in London we have red brick buildings that help to break up the shades of grey.
I think until I re-adjust, I'm going to be spending a lot of time in areas of town with lots of graffiti. That shouldn't be too difficult. We have loads those here.