So my answer from the workshop (wherein some other much-appreciated asshole encouraged me, with time constraints, to answer this in a small group setting!) is as follows:
My utopia would have, as meta-concepts the ideas of free association (and dis-association) and operating on a human-scale. Our concrete things would be minimal shelter and human-scaled transportation.
By free (dis-)association I mean what anarchists always talk about - the understanding that people will come together based on projects and shared interests, and that those same bonds will be rejected or dissolve based on the lack or end of such. These associations could last lifetimes, they could last minutes. It is up to both the individual and the group to determine when the group or the individual is no longer a desirable associate.
Human-scale means, basically, I don't want a world where the speed of communicating, or getting from one place to another place is faster than humans can conceive. Global connections as they exist with jet planes, internet, etc. are all immediate. There is no lag, and I want lag. This is both helpful for being thoughtful, and for avoiding ebola and similar outbreaks.
When I talk about shelter, I mean that it depends - it could be a hoody, it could be a tent or yurt. It isn't permanent, it is a thing that a person born to a place would need to survive the expected worst seasons of where they live.
Human-scale transportation is similarly flexible, it could be sneakers, or a canoe, kayak, sandals, raft, or Flintstone's car (okay, not really a Flintstone's Car, but maybe...) It is what someone needs to realistically travel beyond their immediate area while still not outpacing our own abilities to adapt.