I hope it's alright with you Oboe Shoes, but I went ahead and added a lot more colors using your modified .LEB files as a base.
Here's an updated list of parts that are now included:
Default Bricks: None
Default Race: None
Default Space: 5 "1x2 tile with Handle" bricks (Black/Light gray/Green/Beige/Brown)
Default Castle: 4 castle flags (Beige/Brown/Light gray/Dark gray)
Captain Redbeard: Racing brown flag
King Kahuka: 2 Light gray corner bricks.
Basil the Batlord: 15 brown bricks (Basic bricks, corner bricks, spoiler)..
Johhny Thunder: 11 beige bricks. Beige corners, spoiler and flag in the next set.
Baron von Barron: Beige corners, spoiler, and flag + 8 "3 x 6 without corner" bricks (Red/Yellow/White/Light gray/Dark gray/Green/Beige/Brown)
Gypsy Moth: 7 inverted slopes (Blue/Red/Yellow/Black/Green/Black/Beige).
Rocket Racer: 17 dark gray bricks (Basic bricks, corner bricks, inverted triangle, spoile, racing flag).
Veronica Voltage: 16 green bricks (Basic bricks, corner bricks, spoiler, racing flag).
Most notable are the inclusions of brown and dark gray colors!