I would suggest a Speaker Light Kit with the Angus / Brian silhouette acrylics in front and the blue lightning bolt acrylic designs behind the light frames from
http://www.speakerlightkits.com
PinballPimp sells a speaker panel decal that looks nice (though the picture posted would look much better if the speaker grills were mounted behind the lightning bolt acrylic designs instead of directly behind the silhouette designs).
ebay.com link: Stern AC DC METALLICA Pinball Speaker Grill AMPLIFIER Decal Mod A Must Have
Doug (SpeakerLightKits.com)
ACDC double stack (resized).jpgs-l1600 (resized).jpg