I will be the first to argue that good church music can be old or new, classical or pop or folk or whatever, content dense or repetitive, celebratory or somber. And as I've pointed out before, the best critiques of praise-band music usually come from within that world, not from outside haters.
Anyway, this "How to write a worship song (in five minutes or less)" tutorial from Blimey Cow is a heap of fun.
My first year in college, I had a friend who was going through a bit of a Goth stage. He dressed in all black and spent a lot of his time with his guitar, playing really intense (and often really good) original music.
For his birthday, another friend of ours shot a goofy video (on VHS, I think!) about him. She asked me to appear as his bizarro-world self, so I dressed in all white (can't believe I found white pants somewhere on my dorm floor!) and showed up with my guitar. Then I improvised a major-key adaptation of "The Sound of Silence": "Hello lightness my new friend..."
I'll admit it: I'm one of those people who, back in the 90s, learned Jeff Buckley's version of "Hallelujah" and played it note for note without even realizing it was written by the great Leonard Cohen. Glad to say I'd moved on by the time The West Wing, Scrubs and !@#$% Shrek got hip to the song, but still: no excuse for that.