Politely disagreeing with the people recommending those little rafts and plastic figures to stick in all the corners of the game. I can't help but think those clutter up the playfield and look tacky.
Go with a color DMD - the colors are great during a lot of the water effects images .
I really like the 'Bigfoot spotlight mod' from pinball life. Pretty easy to install, and really seems factory because it is only activated when bigfoot is engaged (diverting ball or during hotfoot). He is such a cool toy, so adding some lighting to him while he is working is great.
To each their own, of course.