However, I do now know that the red color of their bibs is related to this: "According to Japanese folk belief, RED is the color for 'expelling demons and illness.'"(http://www.onmarkproductions.com/html/color-red.html) So the red color expresses the hope for recovery and protection from evil influences and sickness.
While this has nothing to do with the history of ikebana (as far as I know), I found the presence of these well-dressed little statues near the Rokkakudo Temple an irresistible draw.
Another aspect of the temple's environment and one very directly associated with the history of ikebana is the pond pictured to the right. I certainly didn't expect to see a pond with swans gliding on it located between Rokkakudo Temple and the featureless skyscraper next to it. The building you can see in the background of the photo is the headquarters of the School of Ikenobo, and this little pond is said to be the source of its name. Ike means pond, and bo refers to a Buddhist priest's hut. Thus, ikenobo would mean a priest's hut next to a pond, apparently the place of origination of the floral art form first practiced here.