[DustyPorViva]

From an artistic and production stand-point, they're not really clean. Icons of that size should be dealt with on a dedicated level, not just resized images. Icons are meant to be readable, without readability they completely lose their purpose. These images easily lose contrast battles with their background(which can change depending on profiles, so best bet is to choose mid-level colors), and have a hard time defining themselves.
This also goes along with what everyone else is saying that they don't represent their servers. What's the point of an icon if it's not representative?