Sounds like some Takashi Amano right there.(famous planted tank designer who uses neons and cardinals in mass) Also, check out aquarium design groups website. They have really nice pics of what your looking for.
I'm not sure if they would be schooling with numbers that large, or at least would not appear to be schooling. I think it would look more like a bunch of individual fish swimming around without much conformity. I'm not sure exactly what it is, but it seems that there's a threshold for schooling behavior where if you have less fish than the threshold number they will school, and if you have more than the threshold they won't school. It probably has more to do with the density of fish rather than an absolute number. For example, the threshold could be something like 1 neon per 0.5 gallons of water, and anything over that is just too many neons in the space provided to really show schooling behavior.
Take a look at some of these for example:
Basically no schooling behavior:
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