I admit the sky on the building isn't really patterns. But either the reflective panels, or the array of windows is. Does the sky add to it, or ruin it?
The blue pattern I like best of these.
I'd have liked to stop and spend longer on the lamp. There are some wonderful abstract macro shots in there. But my wife was dragging me round the show to go shopping for her doll collection.
No, none of this was with the 20D.