But I suppose it's been done. Examined the floral thingy recently. I would describe it as two shades of silver rather than grey, though it will no doubt fade to grey. Did rather like the gold kitschy pineapples, but they looked like a nervous touch, typical of architects thinking gold is a bit daring, why not go a bit further and add a bit more gold emphasising the circles on the facade or the bit across the middle.
We architects rely on the constant parade of bright and fashionably dressed people, the florescent glow of shop signage and lifestyle advertising, and the uncontrolled clutter of corporation street signage to enliven our discreet, carefully proportioned and subtly coloured buildings.
The portico does not need to compete or shout out. It is a backdrop to the colourfull life of the market.
We artists tend to be quite fond of colour. The drab crowds of tourists fighting their way through Borough Market make it rather hard to see the colourful provender, looking up at the buildings can often be the only way to see anything at all. I am glad you agree about the circles, Michael.