They are organic looking, like virus particles.
As for the water vapor thin film, it is very transient as it evaporates off the slide leaving no trace. Any particles are dust. I did this at -6C, breathed on a very clean slide and watched it evaporate. The colours appear at the very last moment as the droplet layer thins and disappears.
ChrisR wrote:Looks disturbingly organic!
I'd really like to know what it is that evaporated water leaves behind, too
