Oxygen bars

http://en.wikipedia.org/wiki/Oxygen_bar
"An oxygen bar is an establishment, or part of one, that sells oxygen for recreational use. Individual flavored scents may be added to enhance the experience. The flavors in an oxygen bar comes from bubbling oxygen through bottles containing aromatic solutions before it reaches the nostrils: most bars use food-grade particles to produce the scent, but some bars use aroma oils."

A oxygen bar could work for this o2 brief, it has a slightly futuristic feel to it. A bar is a place of social interation - where people "connect". The designs of the bars above are quite poorly thought out and look tacky. Particularity the blue backlighting, these could be redesigned to look a lot better. This could be combined into a whole unit.