How do you specifically get unicorn cars in forza horizon??

[MythicGraveyard]

I have been trying to read up on the forums on how to get them, but none are exactly clear. Can someone help me out?? It would be much appreciated

[WindsweptDragon]

Check this thread http://forums.forza.net/turn10_postst183_Current-unicorn-and-contest-opportunities-in-FH.aspx