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So i created custom race and when i log into a game i get this.

Can someone help me ?
Looks like you somehow got the Thalan ship set?

i never tried a custom race yet myself, but presumably it has to use one races ship set or another?,,, it is not going to materialize a new ship set out of thin air?
There are three separate theme settings: interface, ship icon, ship colors. They have to be deal with individually. You can also alter the ship appearances somewhat further by playing with the material/surface settings as well as the colors.