This replacement chase light board created by stumblor is awesome and is completely plug and play.
I also like this Ford Crown Victoria car mod with working headlights and tail lights.
https://pinballpro.net/shop/creature-black-lagoon-pink-car-accessory/
As NPO mentioned the tail light speaker panel mod created by thompso9 is a great mod, but will be difficult to find unless he makes another run of them.
https://pinside.com/pinball/forum/topic/next-run-of-cftbl-led-speaker-panels#post-3925368
The snack bar mod created by swinks is also a very nice mod that really dresses up the game.
https://pinside.com/pinball/forum/topic/cftbl-creature-snackbar-mod-v20#post-2713963
The MRS (magnetic reed switch) created by Sonic is also very well done and very fun to watch during game play as the ball goes round and round the Creech bowl.
https://pinside.com/pinball/forum/topic/cftbl-fans-and-members-welcome/page/56#post-5378644
Gord