B1 battle droids from Geonosis were a variant of the B1 Battle droid who's outer plates were colored to be a camouflage pattern to blend with the environment ofGeonosis. Although many B1 droids originated on Geonosis, towards the middle of the Clone Wars these were the only ones built on the planet. When Kanan Jarrus, Ezra Bridger and Captain Rex traveled to Geonosis there were droids still active which fought the rebels until Saw Gerrera turned up and outflanked the droids. A Geonosian queen activated an army of these which faced of Darth Vader when he arrived on Geonosis with Dr. Aphra.
For more, see B1 Battle droid