Ok, Here's something I did awhile back, before I knew about this site, and I finally got around to taking pics of it. Darth Vader Cinemacast Statue with Lights & Sounds. I added the sound board from a Dashboard Buddies Darth Vader and two 1-watt LEDs along with several 3mm ultrabright LEDs (1 in the lightsaber hilt). The speaker is placed in the upright section near Vader's right knee, in the detailed pic you can see the small holes I drilled for the speaker, they blend in really well with all the cracks and crevaces. And yes it plugs into a wall outlet with a variable voltage universal power adapter set to 6v 1300mA. I've added some stock photos since some of mine didn't come out to well. As always, Let me know what you think.
*raspy breath* "Hoooo....paaaahhh...hoooooo....paaahhh....The electronics are strong in this one......."