well i really tend to agree with alleged aura apearing around object, i see this sometime too when i'm tired or in strange mood, but it is clear that its not the aura phenomena as described with color description, including the indigo color description

and it make me wonder when ppl do this with mirror or trying to see them because i don't think it is really linked with the aura color, as the aura color is more a 'mental aura' than a 'physical light' aura, it not linked with the physical part of the thing , but more on mental impact the thing have, and it is not really the same that what ppl say they see as aura around ppl

but well after all as it is an intense phenomena i guess if you really concentrate a lot on it you can see it apeear, when i really focus on a color while meditating and i open my eye back, i see all the world tainted with this color for some second or a minute, and i also can see can ppl speak about as seeing things around object and it more seem like eye disfunction due to fatigue than a realy psychic stuff

but well as i don't really know a lot about this , i don't pretend to put some abitraty definition on this
but well from the article link in this site menu i saw this in the 'what is indigo children' article :
and... just in case you heard otherwise from other "indigo" sources, the designated word "Indigo" has nothing to do with the color of an aura! It is the result of scientific observations by a woman who has the brain disorder called synesthesia.
and it make more sense to me than a visual phenomena , hallucination like, that ppl describe as the aura seeing, but maybe it also linked with it don't know