The Pirate badge ship part was recently released as part of the 1.03 (?) opt-in patch.
1. Go to \Steam\steamapps\common\Galactic Civilizations III\Gfx\Components\
2. Copy TerranModel_130.png
3. Go to \My Documents\My Games\GalCiv3\Factions\Logos
3. Paste TerranModel_130.png
4. Rename TerranModel_130.png to RaceLogoTemp.png
[Optional: Use your favorite image editor to modify the highlight color.]
