Just wondering if there are any good sources available for colour schemes for these guys?

The generic uniques I guess you can follow the card.... Did Tempest squadron have any special insignia or anything?

What about the characters?

Well Corellian squadrons usually use the Corellian Bloodstrip on their ships but other than that I doN't think they use any distinguishable pattern.

I believe he means the Correllian Conflict Squadrons. Google is your friend...

The Bloodstripe was earned. In the X-Wing books, Corran Horn flew a white and green schemed X-Wing that he used while in CorSec.

I just used green on Corran's E-wing instead of blue like the rest of his group. Most Imperial aces use white or red stripes/markings to denote their status.