Re: Are there any neutral races\' modifications?
Kuat Drive Yards does here: http://se4kdy.cyberwars.com/
As for new pics for the neutrals: strip the AI from another race (with permission) then add your own AI. Or what I did for the Orion Faction originally was re-color the default shipset...
or get Doga L2 or L3 and make your own 
There may be others who make neutral races...
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