Chris Brown -- My Lambo's Got the Blues ... Even Though I Rep Bloods

Chris Brown loves throwing up Bloods gang signs, but you can't tell by looking at his ride -- he just dropped $10,000 to turn his Lambo ... BLUE!

Chris hit up JC Customz in Bellflower, CA shortly after being released from jail to get a fresh new look for his 2013 Lamborghini Aventador. It's not quite Crips blue ... in fact we're told it's a custom shade called Sky Blue.

The car -- which was previously designed to look like a Nike Air Foamposite Camo sneaker -- had to be totally stripped down during the month-long process, repainted, and then put back together ... according to the shop.

It's no secret Chris likes to design his exotic cars with cool looks ... check out his other creations.