I found these photos on the internet of the Olympic Rings. One shows the rings being transported up the River Thames on their way to the Tower Bridge. The other two show the rings hanging from the Tower Bridge, a night view and a day view. I added some background information about the rings that I found on Wikipedia.
KME Blimey Collection -- Paper-Royalty
JHI EmbellBiggie Old Photo Frames -- Frames
JRA I Love London Collection -- Alphas