You know how real 10-Balls are white with a blue stripe and 10-Ball is red in BFEDIR? Well, 10-Ball used to look like a real 10-Ball, but he wasn't very happy with it. He decided it was time for a change. He asked Golf Ball to extract the blue pigment from his body, making him colorless (10-Ball's old color was reshaped into arms for Lego Brick). He then decided to repaint himself red, which he was much more happy about. By the way, episode W of ALBTWIAIOF is coming soon!
Credit 2 Every1, especially jacknjellify for BFDI.