LeesParts.com has two interactive mods for Monster Bash
Frankenstein Lights
Light up your Frankenstein Targets with a red glow while you assemble Frankenstein's body parts, then the ramp will glow green letting you know that he is ready to be brought to life.
http://www.leesparts.com/products/monsterbash-Frankenstein-lights.html
Scoop Lights
Light up your scoop with a red glow when it will start Drac Attack, Monster Bash or Extra Ball and with a yellow glow when it will start Mummy Mayhem, Monster Mosh Pit or Monsters of Rock.
http://www.leesparts.com/products/monsterbash-Scoop-lights.html