I have a strap for the all-black Tele. I like the strap on my all-black Tele. It's a good strap. But it isn't pretty.
This is a cool-looking strap. I want one!
Of course it is. The Boss is rich. And cool. He can afford cool-looking gear. You get to that level, either your less-cool gear becomes cool because of you or you purchase cool gear to supplement your coolness.
My first strap, now dedicated for use with my acoustic, is a big wide strap I got because I thought it looked like Stevie Ray Vaughn's strap, except it didn't have the big musical notes.
It seems like, past comfort and a certain amount of stick to keep a neck-heavy instrument in place, the strap is a mostly-fashion decision, and like all mostly-fashion decisions in a generally male-centered field, the default choice is black.
Why black? Because you're not gonna be out of place with black. If it was pink paisley and you showed up at a metal show with it, you'd be laughed at. Search for baritone guitars on Musician's Friend and you'll find mostly black instruments, I'm sure for that exact reason.
So, what all-fashion choices have you made with your gear?