The BBC News website has a article on and collection of photos of the 12 posters commissioned for the 2012 London Olympics and Paralympics. I could not help but share one by Bridget Riley, because it reminded me of the magpie&whiskeyjack banner I created (in 2009), though horizontal, different aspect ratio, more muted and uniform in colour selection. Still, though I'm new to her art, there's a certain coincidental something akin.
"Bridget Riley is celebrated for her optically vibrant paintings. The horizontal lines in Rose Rose (pictured) indicate the direction of the Olympic swimming lanes or athletic tracks. Riley, who began her career using only black and white patterns, started to experiment with colour in 1967, the same year she began painting stripes"
See the rest of the posters here.