Cornell - here's some techniques I use, and maybe a different direction for your first idea.
I watch a lot of TLC, Discovery Channel and Travel Channel. Not so much for the sci-fi element, but for the historical shows. I write primarily fantasy, and I find the sweeping vistas they picture there - castles on hillsides, lush and untouched valleys, the pyramids in Egypt - all serve to paint scenes in my mind that I can later draw on for inspiration, or they can even spark ideas. One that I had recently, but rejected because I simply don't have the time for the research, is Stonehenge. I thought it would be interesting to do a twist on history with how the bluestones got from Wales to the Salisbury Plain.
Another technique I use is what I call the "what if method". I'll look up fantasy pictures (since it's my genre). I find one I like - say it's a man on horseback riding away from a castle - and then I ask myself, "Where's he going? Why is he leaving the castle? What if his mother, the queen, just threw him out? What if his father, the king, demanded that he marry someone he knows is no good for him or his kingdom?" My questions to myself could go on for hours, and before I know it, I've got a whole story laid out in front of me, waiting for me to write.
And now on to the twist for your story idea #1 - perhaps the DJ isn't a cult member, but is in fact a demon. He's hiding it well, posing as someone into satanism or whatever, but he's actually a minion of the devil, preparing to unleash hell on earth. Just an idea...
Hope this helps some...
WVWG