As you may already know, It's possible to edit the .LEB files in the PIECEDB folder to change what bricks are available in what color in any given category. (Or, by editing a small bit of binary, add additional bricks.) So for those of you who don't wish to mess with these files yourself, or if you just want a nice base for editing with some of the more common ones already there, I've compiled this little mod which will add the following bricks to your game without overriding anything:
11 new basic bricks in beige to the Johnny Thunder menu
14 new green bricks to the Veronica Voltage menu (The 12 basic brick types, plus the flag and spoiler)
1 new green brick to the Castle menu (the Castle theme flag)
As for why I didn't split the green bricks up between the Standard and Racing menus, there's an unfortunate hard limit of 30 bricks per menu, forcing me to add to menus with smaller amounts of bricks.
Download
This is fairly basic for now, but I plan on adding additional pieces that could benefit from additional colors that I can find space for, and it's a good place to start if you want to edit these menus yourself. Remember, you can always edit these files to get any brick you want in any color temporarily, and then switch it back when you're done. I'll also look into any possibilities of getting around the limit of 30 bricks per menu, but for now, enjoy.