Yeah, the Olympic Logo is complete pants.
Any designs whose appeal depends on their being kept clean and are not - buildings made of white and silver materials that are great in artists' impressions and for a few weeks after their arrival but, on attracting some of the copious dirt of the outside world, quickly look stained and cheap.
On a related note, I still can't understand how so many of the metallic roof tiles in the Jubilee Line have attracted streaks of seaweedy-thick grime, despite being upside down. Some of the escalators there are beginning to resemble the inside of a sewage pipe.